01578cam a22002297 4500001000600000003000500006005001700011008004100028100002200069245011600091260006600207490005100273500001800324520064600342530006100988538007201049538003601121710004201157830008601199856003701285856002601322t0094NBER20140713134551.0140713s1991 mau||||fs|||| 000 0 eng d1 aLeamer, Edward E.10aHeteroscedasticity Diagnostics Based on "Corrected" Standard Errorsh[electronic resource] /cEdward E. Leamer. aCambridge, Mass.bNational Bureau of Economic Researchc1991.1 aNBER technical working paper seriesvno. t0094 aJanuary 1991.3 aWeights are found for weighted least squares estimates such that a selected coefficient (a) changes by one standard deviation or (b) changes in sign. The length of the vector of weight changes is equal to the usual OLS standard error divided by the White-corrected standard errors. Thus the White-corrected standard errors can help decide if it is necessary to adjust the location of the confidence sets to correct for heteroscedasticity. The vector of weight changes is similar to the effect of omitting observations, one at a time. The sensitivity diagnostics of Belsley, Kuh and Welsch are therefore linked with heteroscedasticity issues. aHardcopy version available to institutional subscribers. aSystem requirements: Adobe [Acrobat] Reader required for PDF files. aMode of access: World Wide Web.2 aNational Bureau of Economic Research. 0aTechnical Working Paper Series (National Bureau of Economic Research)vno. t0094.4 uhttp://www.nber.org/papers/t0094 uurn:doi:10.3386/t0094