Hello, I am still struggling w/ the PLYR syntax. I am trying to build a customized function to detect outliers in a data frame based on the interquantile method. My data frame is called "ALL" & I am trying to create two new variables in my data frame: upper=q3+ 1.5*(q3-q1) & lower=q1-1.5*(q3-q1). I already have variables q1 & q3. How could I create the upper and lower variables using plyr so that it applies to the whole dataframe. Thank you for your help.
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