I want to calculate mean (or any other summary statistics of length one, e.g. min, max, length, sum) of a numeric variable (\"value\") within each level of a grouping variable (\"grou开发者_开发技巧p\
I have a DateTime series (see below as an example). I have to assign groups to these dates based on 8 days intervals. Basically, the group should be assigned as per the following rules (for any given
I need to copy values from a column in one dataframe to a column in another if conditions are met. Using the example below, if ID and BirthDate are the same in df1 and df2, AND Week2 is NA then copy t
I have loaded in time series data of creek depth and am needing to calculate total annual values (Oct-April) for each year. The following is what I have tried thus far:
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