This is puzzling me. When you run summary() on a vector of integers you don't seem to get accurate results. The numbers seem to be rounded off. I tried this on three different machines with different OS's and the results are the same.

For a vector:

>a <- 0:628846
>str(a)
 int [1:628847] 0 1 2 3 4 5 6 7 8 9 ...
>summary(a)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
      0  157200  314400  314400  471600  628800 
>max(a)
[1] 628846

For a data.frame:

> b <- data.frame(b = 0:628846)
> str(b)
'data.frame':   628847 obs. of  1 variable:
 $ b: int  0 1 2 3 4 5 6 7 8 9 ...
> summary(b)
       b         
 Min.   :     0  
 1st Qu.:157212  
 Median :314423  
 Mean   :314423  
 3rd Qu.:471635  
 Max.   :628846  
> summary(b$b)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
      0  157200  314400  314400  471600  628800

Why are these results different?

r
Edit
Report