Pew Research Center

Appendix A: Survey Methodology

Survey data in this report are based on Pew Research Center surveys conducted with a nationally representative sample of Hispanics. Differences between groups or subgroups, such as foreign-born and ...
Pew Research Center

Appendix A: 2010 National Survey of Latinos Methodology

Results for this study are based on telephone interviews conducted from Sept. 7 through Oct. 4, 2012, by Social Science Research Solutions (SSRS), an independent research company, among a nationally ...
Simon Fraser University

Stratified Sampling

Suppose that the sample of students described in the previous section was actually selected using stratified random sampling. In stratified sampling, the study population is divided into ...
Simon Fraser University

Example 62.6: Stratum Collapse

In a stratified sample, it is possible that some strata will have only one sampling unit. When this happens, PROC SURVEYREG collapses these strata that contain single sampling unit into a pooled ...
Investopedia

Simple Random Sample vs. Stratified Random Sample: What’s the Difference?

Mary Hall is a editor for Investopedia's Advisor Insights, in addition to being the editor of several books and doctoral papers. Mary received her bachelor's in English from Kent State University with ...