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	Test RESET di Ramsey per la Forma Funzionale	Test di White per l'eteroschedasticità
Campo	Econometria	Econometria
Famiglia	Regression model	Regression model
Anno di origine	1969	1980
Ideatore	James B. Ramsey	Halbert White
Tipo	Test for functional-form misspecification	General test for heteroskedasticity
Fonte seminale	Ramsey, J. B. (1969). Tests for specification errors in classical linear least-squares regression analysis. Journal of the Royal Statistical Society: Series B, 31(2), 350–371.	White, H. (1980). A heteroskedasticity-consistent covariance matrix estimator and a direct test for heteroskedasticity. Econometrica, 48(4), 817–838.
Alias	RESET test, regression specification error test, Ramsey RESET fonksiyonel form testi	White's general heteroskedasticity test, White değişen varyans testi
Correlati	4	3
Sintesi	The Ramsey RESET test, proposed by James Ramsey in 1969, is a general test for functional-form misspecification in a linear regression — for omitted nonlinear relationships between the response and the regressors. It adds powers of the fitted values to the model and checks whether they significantly improve the fit; if they do, the original linear specification has left systematic structure unexplained.	The White test, introduced by Halbert White in 1980, is a general test for heteroskedasticity that makes no assumption about its functional form. It regresses the squared OLS residuals on the regressors, their squares, and their cross-products, so it can detect heteroskedasticity related to any of these terms. The same 1980 paper introduced the heteroskedasticity-consistent ('White') standard errors that are the standard remedy when the test rejects.