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.../me" with the same result. I don't have superuser permission on the machine in question and am planning to install R to my home directory.) Any suggestions? Thank you very much. Best regards, Michael Ash, Assistant Professor of Economics and Public Policy Department of Economics and CPPA University of Massachusetts Amherst, MA 01003 Tel 413-545-6329 Fax 413-545-2921 Email mash at econs.umass.edu http://people.umass.edu/maash

...39;plm' Description: Package: plm Version: 1.2-6 Date: 2010-11-20 Title: Linear Models for Panel Data -- Michael Ash, Associate Professor of Economics and Public Policy Department of Economics and CPPA University of Massachusetts Amherst, MA 01003 Email mash@econs.umass.edu Tel +1-413-545-6329 // Fax +1-413-545-2921 http://people.umass.edu/maash -- Michael Ash, Associate Professor of Economics and Public Policy Department of Economics and CPPA University of Massachusetts Amherst, MA 01003 E...

...e variance covariance matrix for two-step estimation per Murphy and Topel (1985)? That aim is the underlying reason for questions (1)-(3). Thank you very much for your consideration. Best, Michael -- Michael Ash, Associate Professor of Economics and Public Policy Department of Economics and CPPA University of Massachusetts Amherst, MA 01003 Tel +1-413-545-6329 Fax +1-413-545-2921 Email mash at econs.umass.edu http://people.umass.edu/maash

...omputed in by by() but otherwise, the dataframe is indexed by city and race with the 90-50 ratio as the variable cityrace.data <- as.data.frame.table(cityrace.by) Any objections? Best, Michael -- Michael Ash, Associate Professor of Economics and Public Policy Department of Economics and CPPA University of Massachusetts Amherst, MA 01003 Tel +1-413-545-6329 Fax +1-413-545-2921 Email mash at econs.umass.edu http://people.umass.edu/maash