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Author Question: Polynomial regression is a robust method that should be among the first transformations to try on ... (Read 397 times)

dakota nelson

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on: Jun 29, 2018
Polynomial regression is a robust method that should be among the first transformations to try on nonlinear data.
 
 Indicate whether the statement is true or false

Question 2

For a one-group t-test, the degrees of freedom are _____.
 a. n + 1
  b. n(n - 1)
  c. n - 1
  d. n(n + 1)


ergserg

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Reply #1 on: Jun 29, 2018
Answer to Question 1

F
Polynomial regressions, using various powers of X, must be applied very carefully, because powers of X are highly multicollinear. It is impossible to change X by one unit without also changing X2, X3, and so forth.

Answer to Question 2

C


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