Hi, Doc Thank you so much for your answer to the first question. It is very useful and important for me to learn spline further. For the second question, I attach a figure of table from the paper that described the multivariate analysis of Incidence Rate for Outcomes like end-stage renal disease, all-cause mortality, stroke, etc. In this context, eGFR (estimated Glomerular Filtration Rate) could be calculated using different equations (MDRD equation and CKD-EPI equation) based on serum creatinine, age, sex, race. So, there were two different eGFR values for one patient. eGFR was divided into 5 groups (>=120, 119-90, 89-60, 59-30, <30) and the group of 119-89 was defined as reference group in the multivariate analysis. I was confused with how to adjust incidence rate of outcome like all-cause death or Stroke. Just as you said, Logistic regression would give me an estimate of one rate. what is y in equation of logisitic regression for estimate of one rate? I know that y is usually variate (Yes or No, 1 or 0, death or survival) . please give some advice about it.please give some advice about it. If the information of figure is not enough, I attached the fulltext of the paper
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