Cross-section data are collected:

Cross-section data are collected:

Entire Course Link

https://zh.scribd.com/document/340327850/Uop-Tutorial

 Cross-section data are collected:

o  



on different elements for the same variable for different periods of time

o  



on the same variable for the same variable at different points in time

o  



on different elements at the same point in time

o  



for a qualitative variable

 
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