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Message-ID: <402A8DB3.2040900@ipea.gov.br> Date: 2004-02-11T20:16:51Z From: fernando freitas Subject: tobit Heteroscedasticity An embedded and charset-unspecified text was scrubbed... Name: not available Url: https://stat.ethz.ch/pipermail/r-help/attachments/20040211/f9e18292/attachment.pl