Grokbase Groups R r-help March 2002
FAQ
Hi all!

I want to do some logistic regression. Is there a fintion in R that does
this, or do I have to do the variable conversion by hand?

Thankful for all the help I can get.

/Fredrik


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  • Peter Dalgaard BSA at Mar 25, 2002 at 2:39 pm

    Fredrik Karlsson <fredrik.karlsson@ling.umu.se> writes:

    Hi all!

    I want to do some logistic regression. Is there a fintion in R that does
    this, or do I have to do the variable conversion by hand?

    Thankful for all the help I can get.
    glm(...., family=binomial) should do it (unless you mean something
    different than the usual by "logistic regression")
    --
    O__ ---- Peter Dalgaard Blegdamsvej 3
    c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
    (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
    ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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    r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
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  • Martyn Plummer at Mar 25, 2002 at 3:15 pm

    On 25-Mar-2002 Peter Dalgaard BSA wrote:
    Fredrik Karlsson <fredrik.karlsson@ling.umu.se> writes:
    Hi all!

    I want to do some logistic regression. Is there a fintion in R that does
    this, or do I have to do the variable conversion by hand?

    Thankful for all the help I can get.
    glm(...., family=binomial) should do it (unless you mean something
    different than the usual by "logistic regression")
    glm() gives results in terms of log odds ratios. Most epidemiologists
    that I know prefer to think in terms of odds ratios, and it would be
    quite helpful to have a summary function that reports estimates and
    confidence intervals for the transformed parameters. I don't know if
    that is what Fredrik means by "variable conversion", but it reminded me of
    this problem. I suggest a "transform=FUN" argument for summary.glm.

    Incidentally, stata and SAS both have separate procedures for logistic
    regression and glms, perhaps for this reason, in addition to historical
    ones.

    Martyn
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  • Fredrik Karlsson at Mar 25, 2002 at 3:31 pm
    Thank you everyone for the quick responses!

    glm did solve my problem!

    /Fredrik
    On Mon, Mar 25, 2002 at 03:39:18PM +0100, Peter Dalgaard BSA wrote:
    Fredrik Karlsson <fredrik.karlsson@ling.umu.se> writes:
    Hi all!

    I want to do some logistic regression. Is there a fintion in R that does
    this, or do I have to do the variable conversion by hand?

    Thankful for all the help I can get.
    glm(...., family=binomial) should do it (unless you mean something
    different than the usual by "logistic regression")
    --
    O__ ---- Peter Dalgaard Blegdamsvej 3
    c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
    (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
    ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
    -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
    r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
    Send "info", "help", or "[un]subscribe"
    (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch
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  • Jonathan Baron at Mar 25, 2002 at 3:08 pm

    On 03/25/02 15:26, Fredrik Karlsson wrote:
    Hi all!

    I want to do some logistic regression. Is there a fintion in R that does
    this, or do I have to do the variable conversion by hand?
    The simplest way of doing this is to use glm, with
    family=binomial

    See http://www.psych.upenn.edu/~baron/rpsych.htm
    section 6.9.

    --
    Jonathan Baron, Professor of Psychology, University of Pennsylvania
    Home page: http://www.sas.upenn.edu/~baron
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