# R: Robust SE library(sandwich); library(lmtest) coeftest(model, vcov = vcovHC(model, type="HC1"))

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Debugging: The custom field value is: https://drive.google.com/file/d/10HhLFuKNRup_gLwSdHfbd2WzPmjEG9NV/view?usp=sharing

Basic Econometrics Gujarati Ppt - Upd

# R: Robust SE library(sandwich); library(lmtest) coeftest(model, vcov = vcovHC(model, type="HC1"))