Dear R-helper,
How could I count only some variable was exist after running sample
(random) function.
For example,
> testx <- factor(c("Game","Paper","Internet","Time","Money"))
> for(i in 1:2) {
+ x <- sample(testx,replace=TRUE)
+ print(x)
+ }
[1] Money Money Time Internet Time
Levels: Game Internet Money Paper Time
[1] Time Money Game Money Money
Levels: Game Internet Money Paper Time
>
The result above Game, Internet, Money, and Time only exist and
"Paper" was missing.
Best, Sofyan
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