Re: [R] Beginning lm

From: Mark Difford <mark_difford_at_yahoo.co.uk>
Date: Sat, 26 Jul 2008 10:29:08 -0700 (PDT)

Hi Kevin,

>> Can anyone give me a short tutorial on the formula syntax? ... I am sorry
>> but I could not 
>> glean this information from the help page on lm.

You can give yourself a very good tutorial by reading ?formula and Chapter 12 of

file://localhost/C:/Program%20Files/R/R-2.7.1pat/doc/manual/R-intro.html

Mark.

rkevinburton wrote:
>
> I have ussed lm to generate a basic line correlation:
>
> fit = lm(hours.of.sleep ~ ToSleep)
>
> Note: From "Bayesian Computation with R", Jim Albert, p. 7
>
> I understand the simple y = mx + b line that this fits the data to. Now
> apparently I don't understand formulas. The documentation indicates that
> there is an implied "intercept" in the formula so now I want to try and
> fit the line to a second degree polynomial so I tried:
>
> ft = lm(hours.of.sleep ~ ToSleep ^ 2 + ToSleep)
>
> and I still seem to get results that indicate a slope intercept, y = mx +
> b, type of fit. Can anyone give me a short tutorial on the formula syntax?
> I would like to fit the data to 2nd and higher order polynomials, 1 / x,
> log(x), etc. I am sorry but I could not glean this information from the
> help page on lm.
>
> Thank you.
>
> Kevin
>
> ______________________________________________
> R-help_at_r-project.org 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.
>
>

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