[R] Data Checking
Göran Broström
gb at stat.umu.se
Sun Mar 24 13:17:07 CET 2002
On Sun, 24 Mar 2002, Ko-Kang Kevin Wang wrote:
> Hi,
>
> This is a simple question with if elseif....however I am having trouble
> constructing the solution for some reason.
>
> Suppose I have a data set with 3 variables, a, b and c say. Let's say c
> is the sum of a and b. So:
> a b c
> 1 2 3
> 2 3 5
> 3 4 7
> . . .
> . . .
> . . .
>
> Suppose that I know there have been some data entry errors and I want to
> check if ALL values in c is really the sum of a and b, and if not, print
> out the whole line (i.e. all values of a, b and c in that row).
>
> Any help on how I can write this if elseif block will be apprecaited!
Try subsetting:
> dataset <- data.frame(a, b, c)
> dataset[a + b != c, ]
is what you want. You should consider whether you want to test exact or
approximate equality, though.
Göran
>
> Ko-Kang
>
> ------------------------------------------------------------------------------
> Ko-Kang Kevin Wang
> Postgraduate PGDipSci Student
> Department of Statistics
> University of Auckland
> New Zealand
>
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--
Göran Broström tel: +46 90 786 5223
professor fax: +46 90 786 6614
Department of Statistics http://www.stat.umu.se/egna/gb/
Umeå University
SE-90187 Umeå, Sweden e-mail: gb at stat.umu.se
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