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Natural Sciences236
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MétodoEstadística1,836IA y aprendizaje automático1,661Ciencias de la decisión932Métodos de investigación1,354Medición1,745Causalidad y evidencia532Práctica investigadora118
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oncology nursing

ESAS

The Edmonton Symptom Assessment System is a rapid, validated 9-item tool that assesses the severity of common symptoms in cancer and palliative care patients: pain, tiredness, nausea, depression, anxiety, drowsiness, appetite loss, general well-being, and shortness of breath. Developed by Bruera and colleagues at the U

2 fuentes1991
animal science

Estrus Detection

Estrus detection is the identification of the fertile period in female livestock, when ovulation is imminent and animals are sexually receptive. Formalized by reproductive physiologists in the 1960s-1970s, the practice combines behavioral observation, physical signs, and technology-enabled monitoring to identify the op

3 fuentes1960
organizational behavior

Ethical Leadership Scale

The Ethical Leadership Scale (ELS) is a 10-item instrument measuring the degree to which leaders model ethical behavior and hold followers accountable to ethical standards. Developed by Brown, Treviño, and Harrison in 2005, the ELS operationalizes ethical leadership, assessing leader conduct and norm-setting that shape

2 fuentes2005
information systems

ETL Process

The Extract-Transform-Load (ETL) process is a systematic approach to moving data from source systems into a target repository. Formalized in the context of data warehousing, ETL pipelines extract data from diverse operational sources, apply business rules and data quality checks, and load the results into data warehous

3 fuentes1996
reliability

Event Tree Analysis

Event Tree Analysis (ETA) is a forward inductive technique used in reliability and risk engineering to model the possible outcomes that follow an initiating event. Starting from a single undesired event, ETA traces all subsequent event sequences through a binary branching tree representing the success or failure of saf

1 fuente2002
neuroimaging

Event-Related Potential Analysis

Event-Related Potential (ERP) analysis is a method for extracting stereotyped brain electrical responses time-locked to stimulus presentation or behavioral events from EEG recordings. Formalized in the cognitive neuroscience literature by researchers including Sutherland and Picton, ERP analysis enables millisecond-lev

2 fuentes1969
psychology of religion

EWB Scale

The Existential Well-Being Scale (EWB), developed by Paloutzian and Ellison in 1982, is a 10-item self-report measure of existential meaning and well-being: the sense that one's life has purpose, direction, and intrinsic value. Derived from the larger Spiritual Well-Being Scale (which includes religious well-being), th

1 fuente1982
spectroscopy

EXAFS

Extended X-ray Absorption Fine Structure (EXAFS) is a synchrotron-based X-ray spectroscopy technique that measures the local geometric and electronic structure around a specific atom in any material, crystal or amorphous. Discovered by Sayers, Stern, and Lytle in 1971, EXAFS reveals interatomic distances, coordination

2 fuentes1971
sustainability

Exergy Analysis

Exergy analysis is a thermodynamic method that quantifies the maximum useful work obtainable from an energy carrier relative to a reference dead state, revealing where and how irreversibilities destroy quality energy. Formally linked to sustainable development by Marc Rosen and Ibrahim Dincer in 2001, it extends the fi

1 fuente2001
occupational health

Exhaustion and Disengagement Scale

The Exhaustion and Disengagement Scale (EDIS), based on work by Shirom and colleagues, is a brief burnout assessment tool measuring two core dimensions of occupational burnout: emotional, physical, and cognitive exhaustion, and psychological disengagement from work. Developed in the early 2000s, the EDIS emphasizes the

2 fuentes2003
clinical psychology

Exposure and Response Prevention

Exposure and Response Prevention (ERP) is a behavioral intervention designed to reduce anxiety and compulsive behaviors by having clients repeatedly confront feared situations or intrusive thoughts without engaging in safety behaviors or compulsions. Developed by Edna B. Foa and colleagues in the 1980s, ERP is now cons

2 fuentes1986
psychology

Eye-Tracking Analysis

Eye-tracking analysis is a method for recording and quantifying eye movements and gaze patterns during visual tasks, providing direct measures of visual attention, comprehension, and cognitive processing. Advancing from mechanical devices to high-speed infrared cameras, eye tracking enables researchers to identify wher

3 fuentes1998
survey methodology

Face-to-face Delphi Technique

The face-to-face Delphi Technique is a structured, iterative consensus-building method conducted through in-person sessions with a purposively selected panel of experts. Across multiple rounds, panelists independently respond to structured questionnaires, receive aggregated group feedback, and revise their judgments un

2 fuentes1950
survey methodology

Face-to-face Diary Method

The face-to-face diary method is a data collection technique in which participants are recruited, briefed, and supported through in-person researcher contact while keeping structured or open-ended diaries over a defined period. By combining the temporal depth of diary records with the rapport and clarity of direct rese

2 fuentes1980
survey methodology

Face-to-face Field Notes

Face-to-face field notes are a foundational qualitative data collection technique in which the researcher is physically present in the setting and records observations, interactions, events, and contextual details in written form. As the canonical mode of ethnographic and observational research, in-person field notes c

2 fuentes1915
survey methodology

Face-to-face Focus Group

A face-to-face focus group is a structured, moderated group discussion conducted in a shared physical space, typically with 6–10 participants who are selected because they share a relevant characteristic. The moderator follows a semi-structured topic guide to elicit opinions, perceptions, and experiences. Unlike survey

2 fuentes1940
survey methodology

Face-to-face Participant Observation

Face-to-face participant observation is a qualitative data collection technique in which the researcher physically enters a setting and engages with participants in real time to document social behaviour, interactions, and meaning-making as they naturally occur. Unlike online or remote variants, the researcher is bodil

2 fuentes1920
survey methodology

Face-to-face Research Diary

A face-to-face research diary is a systematic reflexive log maintained by the researcher during in-person fieldwork. Unlike participant diaries, this is the researcher's own running record of observations, analytic thoughts, methodological decisions, and emotional responses captured during or immediately after direct,

2 fuentes1981
survey methodology

Face-to-face Semi-structured Interview

A face-to-face semi-structured interview is a qualitative data collection technique in which a researcher meets a participant in person and follows a prepared topic guide of open-ended questions while retaining the flexibility to probe, reorder, and explore emerging themes. It combines the consistency of a predetermine

2 fuentes1940
survey methodology

Face-to-face Sensor Data Collection

Face-to-face sensor data collection involves attaching or deploying sensors — physiological, motion, environmental, or proximity-based — on or around participants during in-person research sessions. The co-present setting allows direct researcher oversight of equipment, real-time signal monitoring, and immediate troubl

2 fuentes1990
survey methodology

Face-to-face structured interview

A face-to-face structured interview is a data collection method in which a trained interviewer meets each respondent in person and asks a fixed set of questions in a predetermined order, recording responses verbatim or using a closed-response format. It combines the response-rate advantages of personal contact with the

2 fuentes1950
survey methodology

Face-to-face Survey

A face-to-face survey is a structured data collection method in which a trained interviewer meets respondents in person and administers a standardised questionnaire. The interviewer reads questions aloud, clarifies wording when permitted by protocol, and records answers — either on paper (PAPI) or a laptop/tablet (CAPI

2 fuentes1930
palliative care

FACIT-Palliative Subscale

The FACIT-Palliative (FACIT-Pal) is a 12-item self-report subscale of the Functional Assessment of Chronic Illness Therapy (FACIT) family, specifically designed to measure spiritual well-being and existential meaning in patients with advanced cancer and life-limiting illness. Developed by Peterman and colleagues in 200

2 fuentes2002
psychology of religion

FACIT-Sp

The FACIT-Sp, developed by Peterman and colleagues in 2002, is a 12-item self-report measure of spiritual well-being specifically designed for people with serious illness, particularly cancer. It assesses two dimensions: meaning and peace (the sense that life has purpose and harmony despite illness) and faith (spiritua

1 fuente2002
oncology

FACT-Anemia

The FACT-Anemia (FACT-An) is a quality-of-life measure combining the 27-item FACT-G core with a disease-specific subscale focusing on fatigue and anemia-related symptoms common in cancer patients receiving chemotherapy or dealing with cancer-induced anemia. Developed by Yellen et al. in 1997, it quantifies the impact o

2 fuentes1997
oncology nursing

FACT-B

The FACT-B is a comprehensive 36-item disease-specific quality-of-life instrument that integrates the generic FACT-G (27 items covering physical, social, emotional, and functional well-being) with a 9-item breast-cancer-specific subscale addressing body image, sexual function, arm symptoms, and treatment side effects.

2 fuentes1997
oncology

FACT-Colorectal

The FACT-Colorectal (FACT-C) is a disease-specific quality-of-life instrument designed for patients with colorectal cancer. It combines the 27-item FACT-G core (general cancer) with a 9-item colorectal-specific subscale addressing bowel function, sexual function, and cancer-related digestive concerns. Validated by Ward

2 fuentes1999
oncology nursing

FACT-G

The FACT-G is a 27-item self-report questionnaire measuring health-related quality of life in cancer patients across four key domains: physical, social/family, emotional, and functional well-being. Developed by Cella et al. in 1993, it has become one of the most widely used generic QoL instruments in oncology research

2 fuentes1993
oncology

FACT-Lung

The FACT-Lung (FACT-L) is a lung-cancer-specific quality-of-life measure that combines a 27-item general cancer assessment with a 7-item lung cancer subscale. Developed by Cella et al. in 1995, it quantifies physical, emotional, social, and functional well-being specifically relevant to lung cancer patients. It is wide

2 fuentes1995
oncology

FACT-Ovarian

The FACT-Ovarian (FACT-O) is a disease-specific quality-of-life measure for women with ovarian cancer, integrating the 27-item FACT-G core with a 12-item ovarian-specific subscale addressing cancer-related symptoms, sexual function, abdominal distension, and treatment side effects. Validated by Basen-Engquist et al. in

2 fuentes2001
oncology

FACT-Prostate

The FACT-Prostate (FACT-P) is a disease-specific quality-of-life instrument for men with prostate cancer, combining the 27-item FACT-G core with a 12-item prostate-specific subscale addressing urinary, sexual, and bowel function concerns. Developed and validated by Esper et al. in 1997, it is a standard outcome measure

2 fuentes1997
occupational therapy

FAI

The Frenchay Activities Index (FAI) is a self-report or informant-rated questionnaire designed to measure participation in activities of daily living and instrumental activities over a 3-month period. Developed by Holbrook and Skilbeck (1983) at the Frenchay Hospital in Bristol, the FAI evaluates participation in 15 ac

2 fuentes1983
ecology

Faith's Phylogenetic Diversity

Faith's Phylogenetic Diversity (PD), introduced by David Faith (1992), measures the evolutionary diversity within a community by summing the branch lengths of a phylogenetic tree connecting all species. Unlike species richness, which counts species equally regardless of evolutionary relationships, PD weights species by

3 fuentes1992
nursing

Falls Efficacy Scale International

The Falls Efficacy Scale-International (FES-I), developed by Lucy Yardley and colleagues in 2005, is a validated tool measuring fear of falling and confidence in balance in older adults and others at risk of falls. The 16-item scale assesses how confident a person feels performing daily activities without falling (self

2 fuentes2005
social psychology

Family Assessment Device

The Family Assessment Device is a widely used self-report instrument designed to measure family functioning across six key domains derived from the McMaster Model of Family Functioning. Developed by Epstein, Baldwin, and Bishop in 1983, the FAD assesses problem-solving, communication, roles, affective responsiveness, a

2 fuentes1983
reliability

Fault Tree Analysis

Fault Tree Analysis (FTA) is a top-down, deductive reliability method that begins with an undesired top-level failure event and systematically traces backward through chains of contributing causes using Boolean logic gates (AND, OR). First formalized by Watson at Bell Telephone Laboratories in 1961 and later standardiz

1 fuente1981
psychology

Fear Conditioning

Fear conditioning is a classical (Pavlovian) learning paradigm in which a neutral stimulus (conditioned stimulus, CS—e.g., a tone or image) is repeatedly paired with an aversive outcome (unconditioned stimulus, US—e.g., mild electric shock or loud noise). After conditioning, the CS alone elicits a fear response. Fear c

3 fuentes1927
animal science

Feed Conversion Ratio

Feed conversion ratio (FCR) is a key metric of nutritional efficiency in livestock, measuring the amount of feed consumed relative to animal growth or product output. Developed by animal nutrition scientists in the mid-20th century, FCR quantifies how efficiently livestock convert dietary nutrients into meat, milk, egg

3 fuentes1950
animal science

Feed Ration Formulation

Feed ration formulation is the process of selecting and blending feed ingredients to meet animal nutrient requirements while optimizing cost and feed acceptance. Formalized by veterinary nutritionists in the 1960s-1970s, the method integrates knowledge of nutrient requirements (energy, protein, minerals, vitamins) with

3 fuentes1960
obstetrics gynecology

Female Pelvic Pain Scale

The Female Pelvic Pain Scale (FPPS) is a standardized self-report instrument designed to assess the severity and functional impact of pelvic pain conditions in women, including dysmenorrhea, pelvic inflammatory disease, interstitial cystitis, and pelvic pain of unclear etiology. By measuring pain intensity, location, t

2 fuentes2001
urology gynecology

Female Sexual Distress Scale

The FSDS is a brief self-report measure designed to assess psychological distress specifically related to female sexual dysfunction. Originally developed by Derogatis and colleagues and published in 2002, the revised version (FSDS-R) comprises 13 items measuring distress about sexual concerns, with particular utility i

2 fuentes2002
urology gynecology

Female Sexual Function Index

The FSFI is a 19-item multidimensional self-report instrument designed to assess sexual function in women across the lifespan. Developed by Rosen and colleagues in 2000, it measures six core domains of sexual response and has become a gold standard in both clinical and research settings for evaluating female sexual dys

2 fuentes2000
survey methodology

Field Notes

Field notes are detailed written records created by researchers during or immediately after direct observation in a naturalistic setting. They capture what is seen, heard, and experienced — including behaviors, interactions, physical environments, and the researcher's own analytic impressions — forming the primary data

2 fuentes
survey methodology

Field-based cluster sampling

Field-based cluster sampling is a probability sampling method in which naturally occurring geographic or administrative groups (clusters) are first randomly selected, and then data are collected in person from units within those clusters. It is the standard design for large-scale field surveys in public health, agricul

2 fuentes1950
survey methodology

Field-based convenience sampling

Field-based convenience sampling is a non-probability technique in which researchers recruit participants by approaching whoever is physically present and accessible at a chosen real-world location — a market, hospital waiting room, park, or transit hub. It is widely used in public health surveillance, marketing resear

2 fuentes
survey methodology

Field-based Deviant Case Sampling

Field-based deviant case sampling is a purposive strategy that deliberately selects cases deviating markedly from an established pattern or norm, with data collected through direct fieldwork — observation, in-situ interviews, and ethnographic engagement — in the participants' natural settings. By studying outliers on-s

2 fuentes1980
survey methodology

Field-based maximum variation sampling

Field-based maximum variation sampling is a purposive strategy in which a researcher deliberately selects field sites, ecological plots, communities, or observational units that span the widest possible range of relevant characteristics. By maximising heterogeneity among selected units, the approach ensures that both c

2 fuentes1990
survey methodology

Field-based Multistage Sampling

Field-based multistage sampling is a probability sampling approach in which the population is drawn from a geographically dispersed or operationally structured field setting through successive nested stages. At each stage, a random subset of sampling units is selected — progressing from large geographic or administrati

2 fuentes1950
survey methodology

Field-based Snowball Sampling

Field-based snowball sampling is a non-probability chain-referral technique in which an initial set of in-person contacts (seeds) recruit further participants from within their real-world social networks, expanding the sample iteratively through face-to-face interaction in naturalistic field settings. It is the default

2 fuentes1961
survey methodology

Field-based Stratified Sampling

Field-based stratified sampling divides a geographically dispersed or heterogeneous target population into internally homogeneous subgroups (strata) defined by features observable in the field — such as land use type, habitat zone, administrative district, or community category — and then independently draws random sam

2 fuentes1934
survey methodology

Field-based systematic sampling

Field-based systematic sampling applies systematic (regular-interval) selection to real-world field environments — plots of land, transects, geographic grids, or physical survey routes. A random starting point is chosen, then every k-th unit or location is sampled at equal spatial or sequential intervals. Widely used i

2 fuentes1940
survey methodology

Field-based theoretical sampling

Field-based theoretical sampling is an iterative qualitative sampling strategy in which decisions about whom to observe or interview next are made during active fieldwork, guided by emerging theoretical insights from the data already collected. Rooted in Glaser and Strauss's grounded theory, it extends theoretical samp

2 fuentes1967
survey methodology

Field-based typical case sampling

Field-based typical case sampling is a purposive qualitative strategy in which the researcher selects and studies cases that represent the ordinary, average, or most common instance of a phenomenon — and conducts data collection through direct fieldwork such as in-person observation, site visits, and face-to-face inter

2 fuentes1980
optics

Finite-Difference Time-Domain

The Finite-Difference Time-Domain method is a computational technique for solving Maxwell's equations by discretizing space and time on a grid. Introduced by Kane Yee in 1966, FDTD is a foundational approach in computational electrodynamics and optical simulation, enabling direct modeling of electromagnetic wave propag

3 fuentes1966
forestry

Fire Weather Index

The Fire Weather Index (FWI) System, developed by the Canadian Forest Service, is a comprehensive weather-based fire danger rating system consisting of six component indices and an overall Fire Weather Index. It uses daily weather observations (temperature, relative humidity, wind speed, and precipitation) to estimate

2 fuentes1987
sleep medicine

FIRST

The Ford Insomnia Response to Stress Test (FIRST) is a brief self-report measure designed to identify individuals with heightened vulnerability to insomnia in response to psychological stress. Developed by Ford and Kamerow in 1990, it captures the tendency to experience sleep disruption during periods of worry, work pr

1 fuente1990
human computer interaction

First-Click Testing

First-Click Testing is a rapid, quantitative method for evaluating whether users click on the correct element to start a task on a web page or screen. Users view a screenshot or live page and are asked to click where they would start a specific task. The test measures success rate (correct first click) and records whic

2 fuentes2000
reliability engineering

First-Order Reliability Method

The First-Order Reliability Method (FORM) is a probabilistic technique for estimating the probability of structural failure given uncertain input parameters. Developed by Allin Cornell in 1969 and refined by Hasofer and Lind in 1974, FORM provides a computationally efficient approximation to the true failure probabilit

4 fuentes1969
human computer interaction

Fitts's Law

Fitts's Law is an empirical model of human rapid aimed movement, predicting that movement time increases logarithmically with the ratio of distance to target size. Formulated by Paul Fitts in 1954, this fundamental law describes how long it takes to move to and select a target (e.g., clicking a button on a screen or re

2 fuentes1954
mindfulness psychology

Five Facet Mindfulness Questionnaire

The Five Facet Mindfulness Questionnaire (FFMQ) is a 39-item self-report instrument designed to measure trait mindfulness across five distinct dimensions: Observing, Describing, Acting with Awareness, Non-judging of Inner Experience, and Non-reactivity to Inner Experience. Developed by Baer and colleagues in 2006 and p

1 fuente2006
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