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Help with Plotting Function
3 messages · Harold Doran, Sundar Dorai-Raj, Jason Turner
Harold Doran wrote:
Dear List: I cannot seem to find a way to plot my data correctly. I have a small data frame with 6 total variables (x_1 ... x_6). I am trying to plot x_1 against x_2 and x_3. I have tried plot(x_2, x_1) #obviously works fine plot(x_3, x_1, add=TRUE) # Does not work. I keep getting error messages. I would also like to add ablines to this plot. I have experimented with a number of other plotting functions and I cannot seem to get this to work. The data are student achievement data. I am trying to plot percentile ranks against scale scores for different grade levels. When plotted as such, they look like logistic curves. I am trying to show graphically the distance along x a student must grow simply to remain at the same percentile rank, y. Thanks. Harold C. Doran One Massachusetts Avenue, NW ?? Suite 700 Washington, DC 20001-1431 202.336.7075
Harold, Looks like you're looking for ?points or ?lines. plot(x_2, x_1) lines(x_3, x_1) --sundar
On Fri, May 21, 2004 at 12:41:53PM -0400, Harold Doran wrote:
Dear List: I cannot seem to find a way to plot my data correctly. I have a small data frame with 6 total variables (x_1 ... x_6). I am trying to plot x_1 against x_2 and x_3.
Sundar has already answered the question - here's another trick for
displaying multiple data sets with lines, etc, to avoide cluttering
any one plot too much...
data(iris)
library(lqs)
plot(iris[,1:3],panel=function(x,y,...) {
points(x,y,...)
zz <- ltsreg(y~x)
abline(zz)
})
Cheers
Jason
Indigo Industrial Controls Ltd. http://www.indigoindustrial.co.nz 64-21-343-545 jasont at indigoindustrial.co.nz