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

From: Daniel Malter <daniel_at_umd.edu>
Date: Tue, 05 Apr 2011 11:38:46 -0500 (CDT)


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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