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Nov 30, 2023 at 7:58 comment added user3490 Logistic regression seems like a good first step here for separating the mode and non-modal values. You could then use another type of regression model to distinguish between the non-modal values.
Nov 29, 2023 at 14:50 vote accept ronald
Nov 29, 2023 at 14:44 comment added Peter Flom Well, could you use the value at a higher level of difficulty? But only you can tell if logistic regression meets your needs.
Nov 29, 2023 at 14:30 comment added ronald Peter, thanks for your early answer. The outcome is a Phsicometric value at the lowest level of difficult. So, many people obtain good results. I have attached the results of residuals in multiple linear regression with lm() function in R.
Nov 29, 2023 at 14:24 history answered Peter Flom CC BY-SA 4.0