[R] z.test for dataframe

[Rui Barradas]

Hello,

Without a data example I can't test this but, the call to ?z.test seems 
to be wrong, you are passing a value for argument 'mu' equal to sd(m) 
but _not_ passing a value for argument 'stdev'. Try

kzt <- sapply(Sep, function(m) z.test(m, stdev = sd(m)))


Hope this helps,

Rui Barradas
Em 17-10-2012 07:45, Balqis escreveu:
> Hi!
> I'm trying to use sapply to my dataframe for z.test function (teaching
> demos package)
>
>
> Sep=cbind(kIp,k02p,k04p,k07p)
> Sep=as.data.frame(Sep)
>
> kzt=sapply(Sep, function(m) z.test(m,sd(m)))
> Error in z.test(m, sd(Sep)) :
>    You must specify a Standard Deviation of the population
>
> kzt=sapply(Sep, function(m) z.test(m,sd(Sep)))
> Error in z.test(m, sd(Sep)) :
>    You must specify a Standard Deviation of the population
>
> #obviously it can't process the z.test because of the sd function embedded
> inside the function. can someone point me how to fix this. Many thanks!
>
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