Get subjects and timepoints with the best quality

This filters data that has both repeats (e.g. multiple images on the same day) and (optionally) longitudinal data. The quality measure should be a "higher is better" measurement.

highestQualityRepeat(mxdfin, idvar, visitvar, qualityvar)

Arguments

mxdfin

Input data frame with repeated measurements and a grouped time variable

idvar

variable name for unique subject identifier column

visitvar

variable name for the visit or date column

qualityvar

variable name for the quality column; higher values should map to higher quality data.

Value

data frame

Author

Avants BB

Examples

mydf = generateSubtyperData( 100 )
mydfhq = highestQualityRepeat( mydf, "Id", "visit", "quality")