what is an example of combining nationally representative data how to use nationally representative sample how is the gss and the nlsy different which national survey is representative how to combine a survey for an analysis what survey can you combine what sample to compare income in nlsy how to do cross sectional analysis which survey has the most data what type of analysis can use data from multiple surveys? what are three types of nationally representative surveys what is considered a cross sectional analysis what are the three survey types examples of nationally representative surveys how to use three nationally representative surveys in analysis how to analyze data in different surveys which nationality is a cross sectional survey what is the sample sample for a cross sectional analysis? how to use different surveys what's the sample size of a nationally representative poll