# [R] Data Checking

ggrothendieck@yifan.net ggrothendieck at yifan.net
Sun Mar 24 15:26:03 CET 2002

```  d <- data.frame( a  = 1:3, b = 2:4, c=c(3,5,9) )    # last row wrong
subset(d, a+b!=c )

On 24 Mar 2002 at 22:41, 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!
>
> Ko-Kang
>
> ------------------------------------------------------------------------------
> Ko-Kang Kevin Wang
> Department of Statistics
> University of Auckland
> New Zealand
>
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