The function mean_glu is a wrapper for the base function mean(). Output is a tibble object with subject id and mean values.
DataFrame object with column names "id", "time", and "gl", or numeric vector of glucose values.
A tibble object with 1 row for each subject, a column for subject id and a column for the mean values is returned. NA glucose values are omitted from the calculation of the mean.
If a data.frame object is passed, then a tibble object with two columns: subject id and corresponding mean value is returned. If a vector of glucose values is passed, then a tibble object with just the mean value is returned. as.numeric() can be wrapped around the latter to output just a numeric value.
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