Ningbo Kou

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Questions related from Ningbo Kou

In robustness test, whether a variable that was initially insignificant but becomes significant after adding control variables can explain conclusion?

When doing linear regression, in order to ensure the robustness of the model, I first included only key variables, but at this time some key variables did not pass the significance test. And when...

24 May 2023 5,802 3 View

In linear regression, does the dependent variable have to be normally distributed?

I saw some statistical analysis articles mention that linear regression requires the dependent variable to remain normally distributed. However, when I performed a linear regression with the...

25 April 2023 4,458 22 View

When linear regression considers the interaction, what to do when both variables have negative numbers after standardize?

When performing linear regression, if the interaction is considered, in order to prevent multicollinearity, it is necessary to standardize the interactive variables and then multiply the two...

17 February 2023 6,926 2 View

Why is the result of regression analysis of all samples significant, but after dividing the samples, all analyzes are no longer significant?

I'm doing a regression analysis of the effect of housing type on resident depression. When I included all samples in a single model, housing type had a significant effect on depression (p=0.000)....

03 February 2023 5,101 4 View