[R] strange results in summary and IQR functions

Chunhao Tu tu_chunhao at yahoo.com
Tue Sep 8 17:09:05 CEST 2009

Dear R users,
Something is strange in summary and IQR. Suppose, I have a data set and I
would like to find the Q1, Q2, Q3 and IQR.  
> summary(x)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
   2.00   11.25   14.00   20.30   31.00   47.00 
> IQR(x)
[1] 19.75
However, I test the same data set in SAS "proc univariate", and SAS shows
that Q1=11, Q2=14 and Q3=31. I think most of us agree that Q1 is 11 not

Could someone please explain to me why R shows Q1=11.25 not 11?

Many Thanks

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