Nothing
#ALG: itree copies this direclty from rpart.
itree.poisson <- function(y, offset, parms, wt)
{
if (is.matrix(y)) {
if (ncol(y) != 2L)
stop("response must be a 2 column matrix or a vector")
if (!is.null(offset)) y[, 1L] <- y[, 1L] * exp(offset)
} else {
if (is.null(offset)) y <- cbind(1, y)
else y <- cbind( exp(offset), y)
}
if (any(y[, 1L] <= 0)) stop("Observation time must be > 0")
if (any(y[, 2L] < 0)) stop("Number of events must be >= 0")
if (missing(parms)) parms <- c(shrink = 1L, method = 1L)
else {
parms <- as.list(parms)
if(is.null(names(parms))) stop("You must input a named list for parms")
parmsNames <- c("method", "shrink")
indx <- pmatch(names(parms), parmsNames, nomatch = 0L)
if (any(indx == 0L))
stop("'parms' component not matched: ", names(parms)[indx == 0L])
else names(parms) <- parmsNames[indx]
if (is.null(parms$method)) method <- 1L
else method <- pmatch(parms$method, c("deviance", "sqrt"))
if (is.null(method)) stop("Invalid error method for Poisson")
if (is.null(parms$shrink)) shrink <- 2L - method
else shrink <- parms$shrink
if (!is.numeric(shrink) || shrink < 0L)
stop("Invalid shrinkage value")
parms <- c(shrink = shrink, method = method)
}
list(y = y, parms = parms, numresp = 2L, numy = 2L,
summary = function(yval, dev, wt, ylevel, digits) {
paste(" events=", formatg(yval[, 2L]),
", estimated rate=" , formatg(yval[, 1L], digits),
" , mean deviance=", formatg(dev/wt, digits),
sep = "")
},
text = function(yval, dev, wt, ylevel, digits, n, use.n) {
if(use.n) paste(formatg(yval[, 1L], digits), "\n",
formatg(yval[, 2L]), "/", n, sep = "")
else paste(formatg(yval[, 1L], digits))
})
}
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