INTRODUCTION TO ECONOMETRICS II ECO 306 NOUN 104 There seems to be no limit to the different possible
types of heteroscedasticity, and consequently, a large number of different tests appropriate for different conditions have been suggested.
The attention here would, however,be focused on three tests that hypothesize a relationship between the variance of the disturbance term and the size of the explanatory variables. These would be
the Spearman rank correlation, Goldfeld–
Quandt, and Glejser tests.
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