Thanks to Thomas and Christos for helpful suggestions.
The forestplot (in package rmeta) suggestion seems to work fairly well
for me, though does require a bit of fiddling (no complaints, obviously
using it for a different purpose than it was written).
Below is an example using a slightly "hacked" version of forestplot (and
also using a ZIP model).
[BTW, my "hacks" were to adjust the code so I could set the line weights
and to use circles as opposed to boxes and set the radii.]
cheers, Dave
## data
data("bioChemists", package = "pscl")
fm_zip <- zeroinfl(art ~ ., data = bioChemists)
summary(fm_zip)
### pull out rate-ratios and 95% CI
rr <- exp(cbind(coef(fm_zip), confint(fm_zip)))
rr
### round to 2 decimal places
rr <- format(rr, digits=2)
####################### Alternative: forestplot() from rmeta package
########################
#
library(rmeta)
preds <- c("Intercept","Women","Married","Kids","PhD","Mentor")
tab.txt <- rbind(c("Predictor","RR [95% CI]"), c("", ""),
cbind(preds, paste(rr[1:6,1], " [", rr[1:6,2], ",
", rr[1:6,3], "]",
sep = "")),
c("", ""),
c("Predictor","OR [95% CI]"), c("", ""),
cbind(preds, paste(rr[7:12,1], " [", rr[7:12,2], ", ", rr[7:12,3],
"]",
sep = "")))
tab.txt
dat.txt <- rbind(c(NA,NA,NA), c(NA,NA,NA), rr[1:6,],
c(NA,NA,NA), c(NA,NA,NA), c(NA,NA,NA),
rr[7:12,])
dat.txt
### NOTE: slightly hacked version of forestplot from rmeta
forestplot2(labeltext = tab.txt,
mean = dat.txt[,1], lower = dat.txt[,2], upper = dat.txt[,3],
zero=1,
is.summary=c(TRUE,rep(FALSE,8),TRUE,rep(FALSE,8)),
xlog=FALSE,
graphwidth = unit(3, "inches"), lwd= 3, rad = 0.3)
########################### Functions
########################################
forestplot2 <-
function (labeltext, mean, lower, upper, align = NULL, is.summary = FALSE,
clip = c(-Inf, Inf), xlab = "", zero = 0, graphwidth = unit(2,
"inches"), col = meta.colors(), xlog = FALSE, xticks = NULL,
boxsize = NULL, lwd = 1, rad = 0.1, ...)
{
require("grid") || stop("`grid' package not found")
require("rmeta") || stop("`rmeta' package not found")
drawNormalCI <- function(LL, OR, UL, size) {
size = 0.75 * size
clipupper <- convertX(unit(UL, "native"), "npc", valueOnly =
TRUE) >
1
cliplower <- convertX(unit(LL, "native"), "npc", valueOnly =
TRUE) <
0
box <- convertX(unit(OR, "native"), "npc", valueOnly = TRUE)
clipbox <- box < 0 || box > 1
if (clipupper || cliplower) {
ends <- "both"
lims <- unit(c(0, 1), c("npc", "npc"))
if (!clipupper) {
ends <- "first"
lims <- unit(c(0, UL), c("npc", "native"))
}
if (!cliplower) {
ends <- "last"
lims <- unit(c(LL, 1), c("native", "npc"))
}
grid.lines(x = lims, y = 0.5, arrow = arrow(ends = ends,
length = unit(0.05, "inches")), gp = gpar(col = col$lines))
if (!clipbox)
grid.rect(x = unit(OR, "native"), width = unit(size,
"snpc"), height = unit(size, "snpc"), gp = gpar(fill
= col$box,
col = col$box))
}
else {
grid.lines(x = unit(c(LL, UL), "native"), y = 0.5,
gp = gpar(col = 1, lwd = lwd))
grid.circle(x = unit(OR, "native"),
#width = unit(size, "snpc"),
#height = unit(size, "snpc"),
r = rad,
gp = gpar(fill = col$box,
col = col$box))
if ((convertX(unit(OR, "native") + unit(0.5 * size,
"lines"), "native", valueOnly = TRUE) > UL) &&
(convertX(unit(OR, "native") - unit(0.5 * size,
"lines"), "native", valueOnly = TRUE) < LL))
grid.lines(x = unit(c(LL, UL), "native"), y = 0.5,
gp = gpar(col = col$lines))
}
}
drawSummaryCI <- function(LL, OR, UL, size) {
grid.polygon(x = unit(c(LL, OR, UL, OR), "native"), y = unit(0.5 +
c(0, 0.5 * size, 0, -0.5 * size), "npc"), gp = gpar(fill =
col$summary,
col = col$summary))
}
plot.new()
widthcolumn <- !apply(is.na(labeltext), 1, any)
nc <- NCOL(labeltext)
labels <- vector("list", nc)
if (is.null(align))
align <- c("l", rep("r", nc - 1))
else align <- rep(align, length = nc)
nr <- NROW(labeltext)
is.summary <- rep(is.summary, length = nr)
for (j in 1:nc) {
labels[[j]] <- vector("list", nr)
for (i in 1:nr) {
if (is.na(labeltext[i, j]))
next
x <- switch(align[j], l = 0, r = 1, c = 0.5)
just <- switch(align[j], l = "left", r = "right",
c = "center")
labels[[j]][[i]] <- textGrob(labeltext[i, j], x = x,
just = just, gp = gpar(fontface = if (is.summary[i])
"bold"
else "plain", col = rep(col$text, length = nr)[i]))
}
}
colgap <- unit(8, "mm")
colwidths <- unit.c(max(unit(rep(1, sum(widthcolumn)), "grobwidth",
labels[[1]][widthcolumn])), colgap)
if (nc > 1) {
for (i in 2:nc) colwidths <- unit.c(colwidths, max(unit(rep(1,
sum(widthcolumn)), "grobwidth", labels[[i]][widthcolumn])),
colgap)
}
colwidths <- unit.c(colwidths, graphwidth)
pushViewport(viewport(layout = grid.layout(nr + 1, nc * 2 +
1, widths = colwidths, heights = unit(c(rep(1, nr), 0.5),
"lines"))))
cwidth <- (upper - lower)
xrange <- c(max(min(lower, na.rm = TRUE), clip[1]), min(max(upper,
na.rm = TRUE), clip[2]))
info <- 1/cwidth
info <- info/max(info[!is.summary], na.rm = TRUE)
info[is.summary] <- 1
if (!is.null(boxsize))
info <- rep(boxsize, length = length(info))
for (j in 1:nc) {
for (i in 1:nr) {
if (!is.null(labels[[j]][[i]])) {
pushViewport(viewport(layout.pos.row = i,
layout.pos.col = 2 *
j - 1))
grid.draw(labels[[j]][[i]])
popViewport()
}
}
}
pushViewport(viewport(layout.pos.col = 2 * nc + 1, xscale = xrange))
grid.lines(x = unit(zero, "native"), y = 0:1, gp = gpar(col = 1))
if (xlog) {
if (is.null(xticks)) {
ticks <- pretty(exp(xrange))
ticks <- ticks[ticks > 0]
}
else {
ticks <- xticks
}
if (length(ticks)) {
if (min(lower, na.rm = TRUE) < clip[1])
ticks <- c(exp(clip[1]), ticks)
if (max(upper, na.rm = TRUE) > clip[2])
ticks <- c(ticks, exp(clip[2]))
xax <- xaxisGrob(gp = gpar(cex = 0.6, col = col$axes),
at = log(ticks), name = "xax")
xax1 <- editGrob(xax, gPath("labels"), label = format(ticks,
digits = 2))
grid.draw(xax1)
}
}
else {
if (is.null(xticks)) {
grid.xaxis(gp = gpar(cex = 0.6, col = col$axes))
}
else if (length(xticks)) {
grid.xaxis(at = xticks, gp = gpar(cex = 0.6, col = col$axes))
}
}
grid.text(xlab, y = unit(-2, "lines"), gp = gpar(col = col$axes))
popViewport()
for (i in 1:nr) {
if (is.na(mean[i]))
next
pushViewport(viewport(layout.pos.row = i, layout.pos.col = 2 *
nc + 1, xscale = xrange))
if (is.summary[i])
drawSummaryCI(lower[i], mean[i], upper[i], info[i])
else drawNormalCI(lower[i], mean[i], upper[i], info[i])
popViewport()
}
popViewport()
}
Dave Atkins, PhD
Research Associate Professor
Department of Psychiatry and Behavioral Science
University of Washington
datk...@u.washington.edu
Center for the Study of Health and Risk Behaviors (CSHRB)
1100 NE 45th Street, Suite 300
Seattle, WA 98105
206-616-3879
http://depts.washington.edu/cshrb/
(Mon-Wed)
Center for Healthcare Improvement, for Addictions, Mental Illness,
Medically Vulnerable Populations (CHAMMP)
325 9th Avenue, 2HH-15
Box 359911
Seattle, WA 98104?
206-897-4210
http://www.chammp.org
(Thurs)
Thomas Lumley wrote:
You could try the forestplot() function in rmeta, or the original grid
code on which it is based,
http://www.stat.auckland.ac.nz/~paul/RGraphics/chapter1.html
-thomas
On Mon, 19 Apr 2010, David Atkins wrote:
Hi all--
I am in the process of helping colleagues write up a ms in which we
fit zero-inflated Poisson models. I would prefer plotting the rate
ratios and 95% CI (as I've found Gelman and others convincing about
plotting tables...), but our journals usually like the numbers
themselves.
Thus, I'm looking at a recent JAMA article in which both numbers and
dotplot of RR and 95% CI are presented and wondering about best way to
do this in R.
Essentially, the plot has 3 columns: variable names, RR and 95% CI,
and dotplot of the same.
Using the bioChemists data in the pscl package and errbar function in
Hmisc package, the code below is in the right direction... but still
pretty ugly.
Wondering if folks would have alternative suggestions about how to go
about this, or pointers on cleaning up the code below (eg, I know
there are many functions for plotting errbars/CI).
[And, obviously, there are somethings that would be straightforward to
clean-up such as supplying better variable names, etc., just wanted to
see if there were better overall suggestions before getting too far on
this route.]
Thanks in advance.
cheers, Dave
library(Hmisc)
library(pscl)
## data
data("bioChemists", package = "pscl")
fm_pois <- glm(art ~ ., data = bioChemists, family = poisson)
summary(fm_pois)
### pull out rate-ratios and 95% CI
rr <- exp(cbind(coef(fm_pois), confint(fm_pois)))
rr
### round to 2 decimal places
rr <- round(rr, 2)
### plot
par(mfrow=c(1,3))
plot(0, type = "n", xlim=c(0,2), ylim=c(1,6),
axes = FALSE, ylab=NULL, xlab=NULL)
text(row.names(rr), x = 1, y = 1:6)
plot(0, type = "n", xlim=c(0,2), ylim=c(1,6),
axes = FALSE, ylab=NULL, xlab=NULL)
text(paste(rr[,1], " [", rr[,2], ", ", rr[,3], "]", sep = ""), x = 1,
y = 1:6)
errbar(x = factor(row.names(rr)),
y = rr[,1], yplus = rr[,3],
yminus = rr[,2])
abline(v = 1, lty =2)
--
Dave Atkins, PhD
Research Associate Professor
Department of Psychiatry and Behavioral Science
University of Washington
datk...@u.washington.edu
Center for the Study of Health and Risk Behaviors (CSHRB)
1100 NE 45th Street, Suite 300
Seattle, WA 98105
206-616-3879
http://depts.washington.edu/cshrb/
(Mon-Wed)
Center for Healthcare Improvement, for Addictions, Mental Illness,
Medically Vulnerable Populations (CHAMMP)
325 9th Avenue, 2HH-15
Box 359911
Seattle, WA 98104?
206-897-4210
http://www.chammp.org
(Thurs)
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Thomas Lumley Assoc. Professor, Biostatistics
tlum...@u.washington.edu University of Washington, Seattle
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
