Interquartile Range

That didn't work Jim!

It always helps to say how the suggestion did not work.  Jim's
function had a typo in it - was that the problem?  Or did you not
change the call to ddply to use that function.  Here is something
that might "work" for you:

 library(plyr)

 data <- data.frame(groupColumn=rep(1:5,1:5), col1=2^(0:14))
 myIqr <- function(x) {
     paste(round(quantile(x,0.25),0),round(quantile(x,0.75),0),sep="-")
 }
 ddply(data, ~groupColumn, summarise, col1_myIqr=myIqr(col1),
col1_IQR=stats::IQR(col1))
 #  groupColumn col1_myIqr col1_IQR
 #1           1        1-1        0
 #2           2        2-4        1
 #3           3      12-24       12
 #4           4    112-320      208
 #5           5  2048-8192     6144

The important point is that
    paste(round(quantile(x,0.25),0),round(quantile(x,0.75),0),sep="-")
is not a function, it is an expression.   ddplyr wants functions.


Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Tue, Apr 19, 2016 at 7:56 AM, Michael Artz <michaeleartz at gmail.com>
wrote:

That didn't work Jim!

Thanks anyway

On Mon, Apr 18, 2016 at 9:02 PM, Jim Lemon <drjimlemon at gmail.com> wrote:

Hi Michael,
At a guess, try this:

iqr<-function(x) {

return(paste(round(quantile(x,0.25),0),round(quantile(x,0.75),0),sep="-")

}

.col3_Range=iqr(datat$tenure)

Jim



On Tue, Apr 19, 2016 at 11:15 AM, Michael Artz <michaeleartz at gmail.com>
wrote:

Hi,
  I am trying to show an interquartile range while grouping values

using

the function ddply().  So my function call now is like

groupedAll <- ddply(data
                 ,~groupColumn
                 ,summarise
                 ,col1_mean=mean(col1)
                 ,col2_mode=Mode(col2) #Function I wrote for getting

the

mode shown below

 ,col3_Range=paste(as.character(round(quantile(datat$tenure,c(.25)))),
as.character(round(quantile(data$tenure,c(.75)))), sep = "-")
                 )

#custom Mode function
Mode <- function(x) {
  ux <- unique(x)
  ux[which.max(tabulate(match(x, ux)))]
}

I am not sre what is going wrong on my interquartile range function, it
works on its own outside of ddply()

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