topic Re: linearity assumption in New SAS User

linearity assumption

shahd — Sat, 24 Nov 2018 18:43:18 GMT

If I want to make sure about the linearity assumption

Does the relationship between categorical variable and y in any model should be nonlinear as it always has the same trend. how can the other plots help me to determine the relationship and if I need any specific type of transformation

Re: linearity assumption [how to improve your question]

Community_Guide — Sat, 24 Nov 2018 22:03:07 GMT

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Re: linearity assumption

PaigeMiller — Sat, 24 Nov 2018 22:46:36 GMT

If you ask me, the idea of fitting a straight line (or any line) to your data is completely off target and wrong. You have categorical X, you want to fit an appropriate model for categorical X, which could be PROC GLM where X is in the CLASS statement.

Re: linearity assumption

shahd — Sat, 24 Nov 2018 22:38:04 GMT

for my understanding, the GLM for categorical y variable. Here x is the categorical I am looking to check the linearity between x and y here. Could you please advise with this

Re: linearity assumption

PaigeMiller — Sat, 24 Nov 2018 22:44:17 GMT

From your plots, the categorical variable is the X variable.

There is no such thing as linearity with a categorical X variable.

Re: linearity assumption

shahd — Sat, 24 Nov 2018 22:46:07 GMT

I need to decide if this relationship between x and y is linear or non-linear so if its non-linear I need to transform the x

Re: linearity assumption

PaigeMiller — Sun, 25 Nov 2018 01:45:59 GMT

Honestly, @shahd, I think you are headed down the wrong path here. I think you are asking meaningless questions. There is no such thing as linearity in the case where you have a categorical X variable.