[R] (no subject)
Spencer Graves
spencer.graves at pdf.com
Fri Sep 17 19:54:45 CEST 2004
Have you considered "predict.lm", at least in R 1.9.1? (If I
understand your question, it is answered in the "examples" to
"predict.lm".)
hope this helps.
p.s. I believe this is described in Venables and Ripley, Modern Applied
Statistics with S, but I don't have this book at my fingertips. Also,
have you read the posting" guide!
http://www.R-project.org/posting-guide.html"? Its suggestions might
help you get quicker answers for yourself without waiting for this list
to reply and might improve the quality of the replies to questions you
submit.
ц╝ц│ц■ц│ц▄ц┴ц▒ ц╢ц┴ц■ц▐ц≈ц│ wrote:
>I have one problem with finding the appropriate functions in R that would perform this operation: We have X, the independent variable, and Y, the response variable, so that a regression line of these variables can be calculated. Using the Student t distribution, we need to find the 95% prediction interval of the mean of Y for the certain value of X. For example, R has the built-in data ( data(cars) ) for cars' speed as the independent variable and cars' stopping distance as the response variable. Find 95% prediction interval of mean stopping distance for cars speeding at 30.
>
>I have another question: is there a certain function in R that can calculate the probability p using the Student t distribution given the certain value, the sample mean, and the sample standard deviation, and df (i.e., the one that functions like pnorm(), but deals with Student t distribution.)
>
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Spencer Graves, PhD, Senior Development Engineer
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