On Thu, 13 Aug 2009, Mcdonald, Grant wrote:
Dear sir,
I am trying to create a barplot for two propotions, with proportions successful
on the y and age on the x. So my data is in the formate of one vector
containing 0s and 1s (i.e.successful or not) with a corresponding two level
vector of age.
success age
1 old
0 young
0 young
1 old
Howeber i cannot find a way to stop r stacking the data using the code:
plot(successfulYN~maleage) as it ends up showing both proportions as i only
want the proportions of success to show.
also entering it as a table results in x axis being removed maybe though this
is the only way
could you please offer any help?
A reproducible example would have been helpful (as the posting guide
explains).
Using the data from ?spineplot:
treatment <- factor(rep(c(1, 2), c(43, 41)), levels = c(1, 2),
labels = c("placebo", "treated"))
improved <- factor(rep(c(1, 2, 3, 1, 2, 3), c(29, 7, 7, 13, 7, 21)),
levels = c(1, 2, 3), labels = c("none", "some", "marked"))
I think you have a plot which is similar to
plot(treatment ~ improved)
showing P(treatment | improved) on the y-axis and P(improved) on the
x-axis. And you want the same y-axis but an x-axis with equal widths on
the x-axis, right? Then you can do
## store the underlying contingency table
tab <- plot(treatment ~ improved)
tab
prop.table(tab, 1)
## plotting with P(improved) x-axis
spineplot(tab)
## plotting with equi-sized bars
spineplot(prop.table(tab, 1))
(Note that the order of the variables would typically be exchanged but
this ordering makes the difference between the different plots more
obvious.)
hth,
Z
Grant McDoanld
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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.
______________________________________________
[email protected] 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.
