[R] again evaluations

[Heberto Ghezzo]

Hello, I wrote the following function to compute multiple comparisons in
a one way anova and randomized blocks anova.

aov1 <- function(y,g,s=NULL,comp="mca",meth="Sidak") {
#
  fun <- function(x)
    c(mean(x,na.rm=T),sd(x,na.rm=T),length(x[!is.na(x)]))
#
  li <- length(unique(g))
  cat("   Analysis of Variance with Multiple comparisons\n\n")
  cat(" Groups : ",li,"\n")
  t <- tapply(y,g,fun)

  a <- array(c(t,recursive=T),c(3,li))
  dimnames(a) <- list(c("Mean","S.Dev","n"),1:li)
  df <- length(y)-li
  cat(" Means : ",a[1,],"\n")
  cat(" S.Dev : ",a[2,],"\n")
  cat("  n    : ",a[3,],"\n\n")
#
  if(is.null(s)) {
    b <- aov(y ~ as.factor(g))
    d <- summary(b)
    df <- b$df
    e <- d[[1]][3]
    sig <- e[[1]][2]
  }
  if(!is.null(s)) {
    b <- aov(y ~ as.factor(g) + Error(as.factor(s)))
    d <- summary(b)
    df <- b$Within[8]
    e <- sqrt(d[[2]][[1]][3])
    sig <- unlist(e[[1]][2])
  }
  cat("   Anova \n")
  print(d)
  cat("\n")
  b <- multicmp(a[1,],a[3,],sig,df.residual=df,method=meth)
  print(b$table)
}
If I call "aov1(x,g)" everything works as expected but with
"aov1(x,g,s=s)" or "aov1(x,g,s)" I get the error

Error in eval(expr, envir, enclos) : Object "y" not found
>
I am using R 1.3.1 on Win98. Can somebody explain why adding a parameter
makes the first parameter invisible?
Thanks

Heberto Ghezzo
Meakins-Christie Labs
McGill University
Montreal - Canada


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