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    Can I set the breakpoint of piecewise regression by theoritic reference?

    I want to prove different regression coefficient for SBP on BMI according to BMI categories. So I want to use piecewise regression. BMI is categorized by WHO guideline which means medicaly proven breakpoint. (<18.5 , 18.5-23, 23-25, 25-30, >30) Can I use these breakpoint ? Or do I have to...
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    Is there proper homoskedasticity test for large sample size data ??

    Hi I want to perform ANOVA. So have to check homoskedasticity and normality. I know that Levene's test has type 2 error for the large sample size. Is there proper homoskedasticity test for large sample size data ? I found hartley's F ratio, but which only gives limited information to the 60...
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    Linearity assumption for logistic regression (very simple question plz help me)

    Hi. Do I have to check linearity assumption of logistic regression (Log odds of outcome with continuous variable) using graph of predicted logodds (by logistic regression) and continuous variable Or using graph with real logodds and continuous variable ? I think the latter is right. In...
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    Question about interaction in regression

    It's my first time to write here to ask question. Please, if someone know any clue for my problem, help me. I'm running logistic regression for outcome on SBP(systolic blood pressure), DBP(diastolic blood pressure), BMI , and other covariates. Because SBP, BMI didn't show linear relationship...