kasturi bardhan wrote:
> hello everybody
> I use the following code for my programming & it runs with the error as
> specified below.Any help that would disolve the error will be highly
> appreciated.
> Thanks in advance
> my code looks like this
> #### R programme for simulating the power of the two sample t test vs various
> #### non-parametric alternatives
> sim.size <- 200
> sample.size <- 10
> set.seed(231)
> mu1 <- 0
> delta <- seq(-2,2, length=50)
> for (j in 1:length(delta))
> {
> mu2 <- mu1 + delta[j]
> for (i in 1:sim.size)
> {
> # Generate ith sample
> samp1 <- rnorm(mean=mu1,sample.size)
> samp2 <- rnorm(mean=mu2,sample.size)
> # Perform ith set of tests
> test1 <- t.test(samp1, samp2,alternative = c("two.sided"))
> pt.test[i] <- (test1$p.value < 0.05)
> test2 <- wilcox.test(samp1, samp2,alternative = c("two.sided"),
> exact = TRUE)
> pw.test[i] <- (test2$p.value < 0.05)
> test3 <- ks.test(samp1, samp2,alternative = c("two.sided"),
> exact = TRUE)
> pks.test[i] <- (test3$p.value < 0.05)
> }
> pow.ttest[j] <- sum(pt.test)/sim.size # Calculate powers for jth setting
> pow.wtest[j] <- sum(pw.test)/sim.size
> pow.kstest[j] <- sum(pks.test)/sim.size
> } # End of j loop
>
> Error in pt.test[i] <- (test1$p.value < 0.05) :
> object "pt.test" not found
Please do your homework yourself, read the psoting guide to this list
and read the error message carefully, it tells you exactly what went wrong.
Additionally, R provides some useful tools for debugging that you could
your prior to spending others' time.
Best wishes,
Uwe Ligges
>
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