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McDonald's hierarchical omega (ωh) is a coefficient derived from a bifactor confirmatory factor model that quantifies what proportion of total-score variance is attributable to a single general factor rather than to group-specific factors or item-level error. Introduced by Roderick P. McDonald (1999) and elaborated for
McDonald's omega is a factor-analysis-based reliability coefficient introduced by Roderick P. McDonald (1999) that quantifies the internal consistency of a composite score without requiring the restrictive assumption that all items contribute equally to the latent factor. It yields two complementary indices: ω_total, w
MCP (Minimax Concave Penalty) is a variable selection method developed by Zhang (2010) that uses a concave penalty function for automated feature selection. Like SCAD, MCP addresses bias in lasso by avoiding shrinkage of large coefficients, but uses a different penalty shape that is computationally simpler than SCAD.
The Meaning in Life Questionnaire (MLQ) is a 10-item self-report measure developed by Steger and colleagues in 2006 to assess both the presence of meaning and the active search for meaning in life. It addresses a core existential dimension of well-being: the degree to which individuals experience their life as purposef
Measurement invariance testing is a sequence of nested confirmatory factor analysis (CFA) models that examines whether a psychological scale measures the same latent construct in the same way across distinct groups or time points. Systematized and popularized by Vandenberg and Lance (2000), the procedure tests a hierar
The Media Literacy Questionnaire is a self-report instrument that assesses individuals' critical abilities regarding digital media: evaluating source credibility, identifying misinformation, recognizing advertising and algorithmic influence, and understanding media ownership and bias. Developed by Wilson and colleagues
The Media Trust Scale measures audience confidence in news media credibility, including perceptions of accuracy, fairness, completeness, and journalists' motivations. Developed by West (1994) and extended by Kiousis (2001), the scale captures both medium-specific trust (trust in TV news vs. newspapers vs. online news)
The MTQ48 is a 48-item instrument measuring mental toughness—the capacity to perform well under pressure, persist through adversity, maintain emotional control, and sustain commitment toward goals. Developed by Clough, Earle, and Sewell in 2002, the MTQ48 operationalizes mental toughness across four dimensions (the '4C
The MAST is a 25-item self-report questionnaire developed to screen for alcohol use disorder and assess alcohol-related problems in adults. First published by Selzer in 1971, it is one of the earliest and most widely used alcohol screening instruments, particularly in primary care, emergency medicine, and addiction med
The Military Identity Scale measures the extent to which a service member's self-concept and life meaning are organized around military role and identity. While no single standardized MIS exists, military psychology researchers have developed identity measures assessing how strongly military identity is internalized, i
The Mindful Attention Awareness Scale (MAAS), developed by Brown and Ryan in 2003, is a 15-item measure of dispositional mindfulness—the tendency to maintain present-moment awareness in daily life. Operationalizing mindfulness as the capacity to pay attention to what is happening now rather than being caught in automat
The Mindfulness Attention Focus Scale (MAFS) is a brief self-report measure designed to assess the degree to which individuals maintain focused, intentional attention on present-moment experience versus experiencing automatic, mind-wandering attention. The MAFS addresses the attentional component of mindfulness from a
The Mindfulness in Teaching Scale (MITS) is a 25-item self-report instrument measuring the degree to which educators apply mindfulness principles and practices within the teaching profession. Developed by Roeser, Schonert-Reichl, and colleagues in research evaluating mindfulness training for teacher burnout reduction,
Mindfulness-Based Stress Reduction (MBSR) is an eight-week, group-based program designed to reduce stress and enhance well-being through systematic training in mindfulness meditation and body awareness. Developed by Jon Kabat-Zinn in 1979, MBSR is now offered in hospitals, clinics, and community settings worldwide, wit
The Modern Racism Scale (MRS) is a 7-item self-report measure developed by John B. McConahay in 1986 to assess subtle, contemporary forms of racial prejudice. Rather than measuring overt hostility, the MRS captures attitudes reflecting the belief that discrimination no longer exists and that racial minorities make ille
The Montgomery-Åsberg Depression Rating Scale is a 10-item clinician-rated assessment designed by Stuart Montgomery and Marie Åsberg in 1979 to measure depression severity and track treatment response. Published in the British Journal of Psychiatry, the MADRS was developed as an alternative to longer instruments like t
The Mood Disorder Questionnaire (MDQ) is a 13-item self-report screening instrument designed to identify individuals at risk for bipolar spectrum disorders. Developed by Hirschfeld and colleagues in 2000, the MDQ assesses symptoms of mania and hypomania as well as the clustering of symptoms into distinct episodes. It i
The MIES is a 9-item self-report measure assessing exposure to morally injurious events in military personnel. Developed by Nash and colleagues in 2013, it captures three dimensions: perpetration (committing acts that violate personal values), betrayal (witnessing leaders/unit members violate moral standards), and obse
The Motivation for Reading Questionnaire (MRQ) is a self-report instrument assessing students' motivation to read and engagement with reading activities. Developed by Wigfield and Guthrie (2000), it measures both intrinsic motivation (reading for enjoyment and understanding) and extrinsic motivation (reading for grades
Motivational Interviewing (MI) is a client-centered counseling approach designed to elicit and strengthen intrinsic motivation for behavioral change. Developed by William R. Miller and Stephen Rollnick in 1991, MI has been extensively applied to substance use disorders, health behavior change, mental health treatment e
Multi-group content validity extends the standard content validity index (CVI) procedure by computing and comparing item- and scale-level validity indices across two or more distinct expert panels or subgroups. It ensures that a scale's items are judged as relevant and representative not only overall but also within ea
Multi-group convergent validity examines whether items purported to measure the same latent construct relate strongly to that construct consistently across distinct subgroups such as demographic categories, cultures, or experimental conditions. It extends single-sample convergent validity checks into a comparative mult
Multi-group differential item functioning examines whether test or scale items function equivalently across three or more distinct groups — such as gender, ethnicity, or country — after matching respondents on the underlying trait being measured. Items that behave differently across groups threaten fair measurement and
Multi-group discriminant validity assessment tests whether constructs measured by a scale are empirically distinct not just in one sample but consistently across two or more groups (e.g., cultures, genders, age cohorts). It extends standard discriminant validity criteria — such as the AVE rule and the HTMT ratio — into
Multi-group generalizability theory (MG G-theory) extends classical generalizability theory to estimate and compare variance components — attributable to persons, items, raters, occasions, and their interactions — simultaneously across two or more defined groups. It reveals whether a measurement procedure is equally re
Multi-group item analysis computes classical item statistics — difficulty, discrimination, and corrected item-total correlations — separately for each subgroup in a sample and then compares those statistics across groups. It is a standard diagnostic step in scale development and test fairness evaluation, revealing item
Multi-group item response theory fits IRT models simultaneously across two or more defined groups — such as males and females, or different cultural samples — to determine whether item parameters are invariant across those groups. It is the primary IRT-based framework for testing measurement equivalence and detecting d
Multi-group McDonald's omega estimates and compares the reliability of a scale across two or more distinct groups. Rooted in confirmatory factor analysis, it uses the factor loadings and unique variances from each group's measurement model to compute omega, then tests whether reliability is statistically equivalent acr
Multi-group measurement invariance testing examines whether a latent construct is measured in the same way across two or more distinct groups — such as cultures, genders, or age cohorts. It is a prerequisite for meaningful group comparisons of latent means or relationships, ensuring that observed score differences refl
The multi-group Rasch model fits the one-parameter logistic item response model simultaneously across two or more distinct groups, testing whether item difficulty parameters are invariant across groups. It is the primary psychometric tool for establishing that a scale measures the same latent trait with the same metric
Multi-group reliability analysis estimates internal consistency or stability coefficients separately within each group and then formally compares them to determine whether a scale functions with equal precision across populations. It is a foundational step in cross-group measurement research, typically carried out alon
Multi-group scale development constructs and validates a measurement scale simultaneously across two or more distinct populations or groups. The approach integrates standard item generation and factor-analytic procedures with a systematic hierarchy of measurement invariance tests to ensure that the resulting scale meas
Multi-group test-retest reliability evaluates whether a measure produces stable scores across time separately for two or more defined groups — such as different genders, age cohorts, or clinical populations — and determines whether the degree of that temporal stability is equivalent across those groups.
The Multidimensional Anxiety Scale for Children (MASC-2) is a 39-item self-report measure of anxiety symptoms in children and adolescents ages 8–19 years. Developed by John March and colleagues in 1997, the MASC operationalizes anxiety as a multifaceted construct comprising physical symptoms, social anxiety, harm avoid
The MPS is a 35-item self-report measure of perfectionism across six domains: concern over mistakes, personal standards, parental expectations, parental criticism, doubt about actions, and organization. Developed by Frost and colleagues in 1990, it is the most comprehensive multidimensional perfectionism measure, disti
The MSPSS is a 12-item self-report scale measuring perceived adequacy of social support from three key sources: family, friends, and significant other. Developed by Zimet and colleagues in 1988, the MSPSS assesses the subjective sense that one has available emotional and instrumental support—a critical protective facto
The National Identity Scale measures the strength and character of individuals' identification with their nation, including attachment to national symbols, pride in national achievements, and sense of belonging to the national community. Developed by Kosterman and Feshbach (1989), it distinguishes patriotism (pride in
Necessary Condition Analysis (NCA) is a set-theoretic method developed by Dul (2016) that identifies conditions necessary (but not necessarily sufficient) for an outcome to occur. Unlike regression, which estimates average effects, NCA identifies absolute thresholds: conditions that must be present at a certain level f
The Need for Cognition in Politics Scale measures individual differences in the tendency to engage in and enjoy effortful cognitive processing related to political information and decision-making. Originally conceptualized by Cacioppo and Petty (1982), the trait reflects whether individuals seek, process, and rely on s
The Need for Cognition Scale (NCS) is an 18-item measure assessing individual differences in the tendency to engage in and enjoy cognitive effort. Developed by John Cacioppo and Richard Petty in 1982, the NCS operationalizes need for cognition as a stable personality trait reflecting preference for thinking about compl
The New Ecological Paradigm (NEP) Scale measures endorsement of an ecocentric worldview that views humans as embedded within, rather than dominant over, nature. Developed by Dunlap et al. (2000) to update the original 1978 scale, the NEP assesses environmental beliefs across multiple dimensions including balance of nat
Neuropsychological assessment is a comprehensive evaluation of cognitive and behavioral functions using standardized tests and observations to identify brain-behavior relationships and diagnose neurocognitive disorders. Rooted in the pioneering work of Alexander Luria in the 1960s and systematized by contemporary neuro
Nomological validity evaluates whether a construct behaves as theory predicts within a broader network of related constructs. It is not a single statistical test but an accumulation of evidence that the measure fits coherently into a web of theoretically grounded relationships — demonstrating that what is measured is w
The Online Disinhibition Effect Scale measures the tendency for individuals to express themselves less inhibitedly online compared to face-to-face contexts, exhibiting increased aggression, profanity, emotional expression, and self-disclosure in digital environments. Developed by John Suler in 2004, this construct expl
Ordinal convergent validity assesses the degree to which indicators of the same latent construct correlate strongly with each other when those indicators are measured on ordinal (e.g., Likert-type) scales. It adapts standard convergent validity procedures — factor loadings, average variance extracted, and HTMT ratios —
Ordinal differential item functioning analysis detects whether an ordered-category item (such as a Likert-scale question) functions differently across demographic or cultural groups after controlling for the latent trait being measured. It extends classical binary DIF methods to polytomous response formats common in ps
Ordinal discriminant validity assesses whether a latent construct measured by ordinal (Likert-type) items is empirically distinct from other constructs in the same instrument. It applies polychoric correlations and ordinal-appropriate factor loadings to standard discriminant validity criteria such as the Fornell-Larcke
Ordinal generalizability theory extends classical G-theory to the analysis of reliability and measurement error when item responses are ordered categorical (e.g., Likert-type) rather than continuous. It partitions score variance into components attributable to persons, facets, and their interactions, while accounting f
Ordinal item analysis evaluates each individual item in a rating-scale or Likert-type instrument using descriptive and correlational statistics suited to ordered categorical response formats. It guides item selection and refinement by flagging items with problematic difficulty, poor discrimination, or low corrected ite
Ordinal McDonald's omega is a reliability coefficient designed for Likert-type and other ordinal rating scales. Unlike Cronbach's alpha, it bases its calculation on polychoric correlations among items — capturing the true latent relationships between ordinal responses — and uses factor-analytic loadings to estimate how
Ordinal measurement invariance testing evaluates whether a multi-group confirmatory factor model holds equivalent measurement properties across groups when scale items are ordinal — such as Likert-type response scales. It uses polychoric correlations and categorical estimators (WLSMV/DWLS) rather than Pearson-based met
Ordinal nomological validity examines whether a construct measured with ordinal items (e.g., Likert-type scales) behaves in theoretically predicted ways within a nomological network — a web of expected relationships with other constructs and criteria — using methods suited to ordinal data rather than assuming continuou
The ordinal Rasch model extends the dichotomous Rasch framework to items with ordered response categories such as Likert-type scales. It places both persons and items on a shared interval-level metric, enabling principled measurement from ordinal data while checking whether items function consistently across all respon
Ordinal reliability analysis estimates the internal consistency of scales whose items are measured on ordered-category (Likert-type) response formats. By basing computations on polychoric correlations rather than Pearson correlations, it corrects for the attenuation that standard Cronbach's alpha produces when response
Ordinal scale development is the systematic construction and validation of multi-item measurement instruments whose response options form an ordered but not necessarily equal-interval sequence — most commonly Likert-type formats (e.g., 1 = Strongly Disagree to 5 = Strongly Agree). It applies psychometric techniques tha
Ordinal test-retest reliability quantifies how consistently an ordinal measurement instrument — such as a Likert-scale questionnaire or a rating tool — ranks or scores the same participants across two separate administrations separated by a stable interval, using correlation and agreement statistics suited to ordered c
The Outcome Rating Scale (ORS) is a 4-item ultra-brief symptom and wellbeing measure designed to track subjective improvement across individual, interpersonal, social, and overall functioning dimensions. Developed by Miller and Duncan, the ORS uses visual analog scales to enable session-by-session outcome monitoring in
The Panic Disorder Severity Scale (PDSS) is a brief 7-item clinician-administered scale designed to measure the severity of panic disorder symptoms, including panic attack frequency, distress, anxiety anticipation, agoraphobic avoidance, and interoceptive fear. Developed by Shear, Brown, Barlow, and collaborators in 19
The Parenting Stress Index is the most widely used multidimensional assessment of parenting stress in mothers and fathers of children from infancy through age 10. Developed by Richard Abidin in 1983, it measures three major stress domains: parental distress (feeling overwhelmed, loss of control, role restriction), pare
The Partisan Identity Scale measures strength and direction of psychological attachment to a political party, encompassing both party preference and emotional party identification. Foundational since Campbell et al.'s American Voter (1960), the measure distinguishes party affiliation (which party one is registered with