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| Линейно-секторно измерване (Line-Intercept Sampling)× | Систематична извадка× | |
|---|---|---|
| Област≠ | Извадка | Методология на проучванията |
| Семейство | Process / pipeline | Process / pipeline |
| Година на възникване≠ | 1941 | Mid-20th century (Cochran 1953; Kish 1965) |
| Създател≠ | Richard H. Canfield | William G. Cochran; formalized in survey sampling theory |
| Тип≠ | Ecological field sampling method | Probability sampling design |
| Основополагащ източник≠ | Canfield, R. H. (1941). Application of the line interception method in sampling range vegetation. Journal of Forestry, 39(4), 388–394. DOI ↗ | Cochran, W. G. (1977). Sampling Techniques (3rd ed.). John Wiley & Sons. ISBN: 978-0471162407 |
| Други названия≠ | Line Intercept, LIS | interval sampling, systematic random sampling, equal-interval sampling, fixed-interval sampling |
| Свързани≠ | 1 | 5 |
| Резюме≠ | Line-Intercept Sampling (LIS) is an ecological field method developed by Richard H. Canfield in 1941 for estimating vegetation cover, plant density, and structural characteristics in rangeland and forest surveys. By laying a linear transect across a study area and recording all plants intersecting the line, LIS provides efficient, unbiased estimates without requiring plots or quadrats. | Systematic sampling is a probability sampling technique in which every k-th element is selected from an ordered list of the population after a random starting point. With population size N and desired sample size n, the sampling interval k = N/n is computed and one unit is chosen at random from the first interval; all subsequent units are selected by adding k repeatedly. The method is operationally simple, yields a spread-out sample, and often achieves lower variance than simple random sampling when the list has no harmful periodicity. |
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