Good day. I watched videos on detecting outliers by using studentized residuals on proc reg, which has a default alpha=0.05 (95% confidence level), thus it tells that if the studentized residual is greater than 3, then it is considered an outlier. If I were to change the alpha into 0.01 (99% confidence level), at what least value for studentized residual can I consider to be an outlier? Many thanks!
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