[R] How to plot vertical line

[David Barron]

abline(v=c(intercept1,intercept2,intercept3))

On 09/06/07, adschai at optonline.net <adschai at optonline.net> wrote:
> Hi,I have a result from polr which I fit a univariate variable (of ordinal data) with probit function. What I would like to do is to overlay the plot of my fitted values with the different intercept for each level in my ordinal data. I can do something like:lines(rep(intercept1, 1000), seq(from=0,to=max(fit),by=max(fit)/1000))where my intercept1 is, for example, the intercept that breaks between y=1 and y=2 labels and the max(fit) is the maximum of overall fitted values or maximum of all ordinal y labels. I'm wondering if there is better way to do this? If you could let me know, I would really appreciated. Thank you.- adschai
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David Barron
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP