[R] Data Checking

[ggrothendieck@yifan.net]

  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
> Postgraduate PGDipSci Student
> Department of Statistics
> University of Auckland
> New Zealand
> 
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