This is actually the sixth in a number of lecture notes which, if tied together right into a textbook, may be titled "Practical Regression." The objective of the notes would be to supplement the theoretical content on most statistics texts with practical advice according to nearly 30 years of expertise from the author, coupled with over a century of expertise of co-workers who've offered guidance. Because the title "Practical Regression" indicates, these notes are helpful tips for carrying out regression used. This note starts by explaining the issues that arise when variables are measured with noise. The note progresses to describe how you can test for and proper heteroskedasticity. Additionally, it describes why it's important to regulate standard errors whenever using grouped data.
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