The function mad produces MAD values in a tibble object.
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 MAD values is returned. NA glucose values are omitted from the calculation of the MAD.
MAD is calculated by taking the median of the difference of the glucose readings from their median mean(|gl-median(gl)|), where gl is the list of Blood Glucose measurements
If a data.frame object is passed, then a tibble object with two columns: subject id and corresponding MAD value is returned. If a vector of glucose values is passed, then a tibble object with just the MAD value is returned. as.numeric() can be wrapped around the latter to output just a numeric value.
David Buchanan, Marielle Hicban
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