[R] two questions re: the use of lattice (Q1 SOLVED, not Q2)

[Peter Ehlers]

On 2012-07-22 09:02, Ranjan Maitra wrote:
> Dear friends,
>
> Many thanks to Jim (Holtman) and David (Carlson) for their quick
> responses: Q1 is now solved. There are two almost equivalent ways for
> doing this. They follow:
> library(lattice)
>
> z <- rbind(cbind(z, 0), cbind(z, 20), cbind(z, 40))
> z <- cbind(z, rnorm(n = nrow(z)))
> z <- as.data.frame(z)
> names(z) <- c("Method", "sigma", "INU", "Error")
> sigma <- as.numeric(levels(z$sigma))
> sigmaExprList <- lapply(sigma, function(s) bquote(italic(sigma) == .
> (s))) sigmaExpr <- as.expression(sigmaExprList)
>
> z$Method <- factor(z$Method, levels = c("BIC", "ICL", "s_v", "Q_v",
>    "sig-q", "s_lsk", "s_lML", "s_mlsk", "s_mlML", "s_la8", "s_haar"))
>
> bwplot(Error~Method | sigma, data = z[z[,"INU"] == 0,
>                                 ],scales=list(rot=90),
>         horiz = F, xlab = "Method", ylab = "Relative Error",
>         strip = function(which.given, which.panel, var.name,
>           strip.levels = FALSE,
>           strip.names = TRUE, ...) {
>           strip.default(which.given, which.panel,
>                         var.name = sigmaExpr[which.panel],
>                         strip.levels = FALSE,
>                         strip.names = TRUE, ...)
>          },
>          layout = c(1, 5),  col = "red")
>
> # On the other hand, if we do not want to change z$Method in perpetuity, we could do the following:
>
>
> z <- cbind(rep(c("BIC", "ICL", "s_v", "Q_v", "sig-q",
>                        "s_lsk", "s_lML", "s_mlsk", "s_mlML", "s_la8",
> "s_haar"), each = 250), rep(c(5, 10, 20, 30, 50), each = 50))
> z <- rbind(cbind(z, 0), cbind(z, 20), cbind(z, 40))
> z <- cbind(z, rnorm(n = nrow(z)))
> z <- as.data.frame(z)
> names(z) <- c("Method", "sigma", "INU", "Error")
> sigma <- as.numeric(levels(z$sigma))
> sigmaExprList <- lapply(sigma, function(s) bquote(italic(sigma) == .
> (s))) sigmaExpr <- as.expression(sigmaExprList)
>
> bwplot(Error~factor(Method, levels = unique(Method)) | sigma, data = z[z
> [,"INU"] == 0, ],scales=list(rot=90),
>         horiz = F, xlab = "Method", ylab = "Relative Error",
>         strip = function(which.given, which.panel, var.name,
>           strip.levels = FALSE,
>           strip.names = TRUE, ...) {
>           strip.default(which.given, which.panel,
>                         var.name = sigmaExpr[which.panel],
>                         strip.levels = FALSE,
>                         strip.names = TRUE, ...)
>          },
>          layout = c(1, 5),  col = "red")
>
>
>
> # However, I am unable to solve Q2. Actually, even more basic is the fact that I can not get Box-Whisker plots without anything else. David's suggestion of using useOuterStrips appears reasonable, but as I said, I can not get anything meaningful even before then.
>
> # Try:
>
> bwplot(Error~Methods | sigma + INU, data = z,scales=list(rot=90))
>
> Any suggestions?

[I had to dig back to see what your Q2 was. It's good to keep context.]

Try this:

  p <- bwplot(Error~Method | sigma + INU, data = z,
         scales = list(rot=90), horiz = FALSE,
         layout = c(5,3), col = "red")

  require(latticeExtra)
  useOuterStrips(p,
       strip = <<your sigma-strip function>>,
       strip.left = strip.custom(
           var.name = "INU", sep = " = ",
           strip.names = TRUE)
  )

Peter Ehlers

>
> Many thanks again!
>
> Best wishes,
> Ranjan
>
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