Okay, I think I've got a good plan for this. I'll use PROC SURVEYSELECT with the STRATA statement to handle the county stratification, and then set the SAMPRATE= option to 0.6 to get the 60% training set. The remaining 40% will be the validation set. Feels like a solid approach.
This seems straightforward enough. I'll just use the PROC SURVEYSELECT statement with the OUT= option to create the training and validation data sets, and then include the STRATA statement to split it up by county. Shouldn't be too hard to get the 60/40 split.
I'm a bit confused on how to handle the stratification part. Do I need to do some kind of grouping or sorting by county first before running the PROC SURVEYSELECT? I want to make sure I get the split right.
Okay, I think I've got a strategy for this. I'll use the PROC SURVEYSELECT statement to randomly select 60% of the observations for the training set, and then use the remaining 40% for the validation set. And I'll make sure to include the STRATA statement to split it up by county.
Hmm, this looks like a tricky one. I'll need to think through the SAS code carefully to make sure I get the 60/40 split right and account for the stratification by county.
Okay, I think I've got this. The key is to identify the one option that is not a valid reason for the error. I'll eliminate the options that make sense and select the one that doesn't fit.
Onita
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