specimens | R Documentation |
stdtest has been done on everyone, and sampledtest has been done on a stratifed subsample of 275 out of 402 specimens (is NA on the other 127 specimens)
data(specimens)
A data frame with 402 observations on the following 3 variables.
stratum
6 strata used for sampling
stdtest
standard test result available on all specimens
sampledtest
new test result available only on stratified subsample
data(specimens)
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