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This is a short and narrow file with one record per PSU and just two variables
testPSU
A data frame with 2 columns and 16 rows:
psu
The PSU identifier. This must use the same coding system used to identify the PSUs that is used in the main RAM-OP dataset
pop
The population of the PSU
The PSU dataset is used during data analysis to weight data by PSU population.
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