[R] Data Checking
Uwe Ligges
ligges at amadeus.statistik.uni-dortmund.de
Sun Mar 24 12:26:39 CET 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!
Assume your "data set" is a data.frame():
X <- data.frame(a=1:5, b=2:6, ce=c(3,5,7,6,11))
# Let's call it a, b, ce --- c already is a function
# Now get the rows with errors:
X[X$a + X$b != X$ce, ]
So you neither need the construct
if(condition){
statement
}
else{
statement2
}
nor
elseif(condition, statement1, statement2)
Uwe Ligges
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