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Thread: Hypothesis

  1. #16
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    Re: Hypothesis




    I've always thought that was only for certain types of contrasts though. I don't know how to specify a generic contrast through that parameter.

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    Re: Hypothesis

    sorry ? im not with you...

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    Re: Hypothesis

    im macbook air cannot handle these calcuations... please help with an answer.

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    Re: Hypothesis

    Quote Originally Posted by Dason View Post
    I've always thought that was only for certain types of contrasts though. I don't know how to specify a generic contrast through that parameter.
    I don't know. I've never really dealt with contrasts before. I know you can define some predefined functions on how to deal with contrasts, but the parameter in lm takes,

    A list, whose entries are values (numeric matrices or character strings naming functions) to be used as replacement values for the contrasts replacement function and whose names are the names of columns of data containing factors.
    I think I recall reading something somewhere about how you can define your own contrast functions, too, but maybe I'm thinking of something else.

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    Re: Hypothesis


    Yeah the only thing I think I've seen that used for is to change from the R style contrasts to the SAS style contrasts when somebody was trying to get the R output to match up exactly with the SAS output.

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