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Found 217 dataset(s) matching "stratified random".
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This collection includes data collected from a subsample of participants interviewed near the end of the thirteenth follow-up of the Northwestern Juvenile Project (NJP). NJP is a longitudinal...
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This data collection effort examined the influence of drug use on three key aspects of offenders' criminal careers in violence: participation, frequency of offending, and termination rate. A...
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This dataset provides information on interannual trends in annual maximum vegetation greenness from 1985 to 2019 for recently undisturbed areas in the boreal forest biome. Multi-decadal changes in...
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The Pregnancy Risk Assessment Monitoring System (PRAMS) is an ongoing, population-based risk factor surveillance system designed to identify and monitor selected maternal experiences and behaviors...
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This Annual NLCD Reference Data Product includes the collection of an independent dataset of 8,360 30-meter by 30-meter samples across the Conterminous United States (CONUS). The Annual NLCD...
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Data on distance learning and supplemental feeding programs were collected from a stratified sample of 600 school districts. School districts were divided into quartiles based on the percentage of...
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Summary of proposed field methods and activities: Methodology This project will engage citizen scientist to run camera traps, code images, and upload data that can be used to address our research...
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During the spring and summer of 2022, the U.S. Geological Survey collected water-quality samples for nutrient analysis at 45 stations across the state of Connecticut and adjacent areas of New York...
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This dataset provides estimates of total organic soil carbon (SOC), pyrogenic (PyC), particulate (POC), and other organic soil carbon (OOC) fractions in 473 surface layer soil samples collected...
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Each month (except March 2012), we collected detailed data on the infection status of intertidal snails from ten fixed sites as part of a broader effort to understand food webs in California...
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Each month (except March 2012), we collected detailed data on the density, size distribution, and infection status of intertidal snails from ten fixed sites as part of a broader effort to...
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The marine debris data included in this dataset are from annual shoreline surveys conducted from 2013 to 2016 at the islands of Midway Atoll (Eastern, Spit, and Sand Islands) in the Northwestern...
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Arid ecosystems are often vulnerable to transformation to invasive-dominated states following fire, but data on persistence of these states are sparse. The grass/fire cycle is a feedback process...
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A validation assessment of Land Cover Monitoring, Assessment, and Projection Collection 1.1 annual land cover products (1985-2019) for the Conterminous United States was conducted with an...
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A validation assessment of Land Cover Monitoring, Assessment, and Projection (LCMAP) Collection 1 annual land cover products (1985–2017) for the Conterminous United States was conducted with an...
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These data (all data tables for the data release) represent a suite of biotic and abiotic variables that characterized plant communities and the geologic, geomorphic, edaphic, climatic, and land...
