xyplot doesn't seem to want to label my x-axis with dates but instead puts
the day-number for each date.
begdate is the number of days since January 1, 1960 and was initially
created by
library(date)
...
polls$begdate<-mdy.date(begmm,begdd,begyy)
I create a new dataframe (pollstack) which includes begdate. In the process
begdate seems to lose its date attribute so I redo it as:
> pollstack$begdate<-as.date(pollstack$begdate)
after which
> attach(pollstack)
> summary(pollstack)
begdate pct names
First :15Nov2002 Min. : 0.000 Clark : 54
Last :10Sep2003 1st Qu.: 2.000 Dean : 54
Median : 5.000 Edwards : 54
Mean : 6.991 Gephardt: 54
3rd Qu.:12.000 Graham : 54
Max. :29.000 Kerry : 54
(Other) :216
>
And all seems well.
But xyplot continues to use day number on the x-axis. My plots are created
by
print(xyplot(pct ~ begdate | names, pch=2, cex=.2,
prepanel = function(x, y) prepanel.loess(x, y, span = 1),
main="2004 Democratic Primary Race",
xlab = "Date of Survey",
ylab = "Percent Support",
panel = function(x, y) {
panel.grid(h=-1, v= -1)
panel.xyplot(x, y, pch=1,col=2,cex=.7)
panel.loess(x,y, span=.65, lwd=2,col=4)
}, ) )
What am I missing?
Thanks!
Charles
/******************************************
** Charles H. Franklin
** Professor, Political Science
** University of Wisconsin, Madison
** 1050 Bascom Mall
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** mailto:[EMAIL PROTECTED] (best)
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