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heteroscedasticity
(redirected from Heteroskedasticity)

   Also found in: Financial, Wikipedia 0.01 sec.
heteroscedasticity
an irregular scattering of values in a series of distributions; accompanied by a comparable scatter of variances.


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1980, "A Heteroskedasticity-Consistent Covariance Matrix Estimator and a Direct Test for Heteroskedasticity," Econometrica 48, 817-838.
The asterisks are used to represent the statistically significant coefficients at the 1% (***), 5% (**) and 10% (*) significance levels, based on heteroskedasticity and autocorrelation adjusted errors (following Newey and West, 1987).
The data series may exhibit Heteroskedasticity and serial correlation problems as they often tend to cause biased standard errors for coefficients, producing invalid statistical inferences.
 
 
 
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