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Can any one help me with how to perform linear regression in rapidminer

User: "Aravind_Yadav"
New Altair Community Member
Updated by Jocelyn
Hi,
I have got an error while applying linear regression please find the screenshot and help me with this issue

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    User: "Caperez"
    Altair Community Member
    Hi @Aravind_Yadav
    Remember that the linear regression doesn't work with nominal attributes, the model is waiting for numerical data.

    Best,

    Cesar
    User: "BalazsBaranyRM"
    New Altair Community Member
    Accepted Answer
    You can use "Nominal to Numerical" to encode the categorical data to 0/1 numbers, by creating new attributes. Dummy coding is a good choice.
    User: "Aravind_Yadav"
    New Altair Community Member
    OP

    User: "Aravind_Yadav"
    New Altair Community Member
    OP
    I have tried and getting the error can anyone please help with this issue?
    User: "BalazsBaranyRM"
    New Altair Community Member
    Hi!

    You connected Group Models in a wrong way.
    The first input of Group Models should be the pre output of Nominal to Numerical. The second will be the actual model (mod output of Linear Regression). Then you will apply the grouped model (the one consisting of NomToNum and the regression) using Apply Model. This makes sure that the same kinds of transformations are applied on both the training and the testing dataset.

    Regards,
    Balázs