01599cam a22002417 4500001000600000003000500006005001700011008004100028100002000069245013500089260006600224490005100290500001000341520061500351530006100966538007201027538003601099700002101135710004201156830008601198856003701284856003601321t0027NBER20140823155924.0140823s1983 mau||||fs|||| 000 0 eng d1 aBrown, Charles.14aThe Effect of Ignoring Heteroscedasticity on Estimates of the Tobit Modelh[electronic resource] /cCharles Brown, Robert Moffitt. aCambridge, Mass.bNational Bureau of Economic Researchc1983.1 aNBER technical working paper seriesvno. t0027 a1983.3 aWe consider the sensitivity of the Tobit estimator to heteroscedasticity. Our single independent variable is a dummy variable whose coefficient is a difference between group means, and the error variance differs between groups. Heteroscedasticity biases the Tobit estimate of the two means in opposite directions, so the bias in estimating their difference can be significant. This bias is not monotonically related to the true difference, and is greatly increased if the limit observations are not available. Perhaps surprisingly, the Tobit estimates are sometimes more severely biased than are OLS estimates. aHardcopy version available to institutional subscribers. aSystem requirements: Adobe [Acrobat] Reader required for PDF files. aMode of access: World Wide Web.1 aMoffitt, Robert.2 aNational Bureau of Economic Research. 0aTechnical Working Paper Series (National Bureau of Economic Research)vno. t0027.4 uhttp://www.nber.org/papers/t002741uhttp://dx.doi.org/10.3386/t0027