This is a function that returns a dataframe in which the person-level standard deviation of the daily minimums of any input variables has been calculated. Output variables will be named 'input_variable_day_min_sd'. Note carefully that this is -not- the min of the standard deviations within each day. Rather, the minimum at each day is taken, then the standard deviation of these minima is calculated.
1 | day_min_sd(data, variables, person_id, day_id)
|
data |
The input dataset |
variables |
A character vector of input variables e.g. c('negemo', 'posemo'). |
person_id |
The person level grouping variable - this should be your person id variable. |
day_id |
The day level grouping variable - this should be your day id variable. |
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