[R] Precision of summary() when summarizing variables in a data frame

Daniel Malter daniel at umd.edu
Tue Apr 5 18:38:46 CEST 2011


I summary() a variable with 409908 numeric observations. The variable is
part of a data.frame. The problem is that the min and max returned by
summary() do not equal the ones returned by min() and max(). Does anybody
know why that is? 

> min(data$vc)
[1] 15452
> max(data$vc)
[1] 316148
> summary(data$vc)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
  15450   21670   40980   55500   63880  316100 

R version 2.11.1 (2010-05-31) 

[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] sqldf_0.3-5           chron_2.3-39          gsubfn_0.5-5         
[4] proto_0.3-8           RSQLite.extfuns_0.0.1 RSQLite_0.9-4        
[7] DBI_0.2-5     

Thanks much,

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