addStandDiff: A function to calculate standardized differences between xi...
In Somtom/somtomlib:

A function to calculate standardized differences between xi and the rolling mean of xi-1 to xi-n for given variables in a data frame. It calculates the difference between xi and the rolling mean. At the end it divides the calculated difference by the standard deviation and adds the results to dt

1 2	addStandDiff(dt, nDays, groupVars = "calf", vars, dateColumn = "date", sdMethod = "cumulative", group = FALSE)

`dt`	data frame which includes the variables for which to calculate the standardized differences
`nDays`	number of days to use for rolling mean and rolling sd
`groupVars`	name of grouping variable ind dt if calculation should be done groupwise (e.g. for each calf individual).Must be Character. Default = '"calf"'
`vars`	character vector of variable names for which to calculate the standardized differences
`dateColumn`	name (character) of date column which is used to arrange data Default = '"date"'
`sdMethod`	parameter to choose how standard deviation (used for standardizing) is calculated: '"cumulative"' - calculates standard deviation from first value in vector (x[1]) to x[i] and updates it for every x[i] '"rolling"' - calculates running standard deviation within the same window as the rolling mean (-> nDays)

Returns differnce to rolling mean 'diffToRollMean', rolling sd 'rollSD' and standardized differnece 'standardDiff' for all given variables and adds them to the data frame

Somtom/somtomlib documentation built on May 28, 2019, 3:16 p.m.