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...X)[ names[ X] == "bob"]<-"sue" ? A semi-related question: how does one get the index of a column by name, something along the lines of col.index( X, "sue") ? Chip Barnaby --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

...thout success. Also, I assume that lm() does not make a copy of input data? That is, if I want "predict( LMX[ i])", I would have to retain a copy the associated DXS subsets? TIA, Chip Barnaby --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

...The source row value of vx is overwritten. A2 would have 10 times as many rows as A. I have of course discarded idea of using of a for loop, but maybe that is what it takes. TIA etc, Chip Barnaby --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

...All the aggregate() examples (e.g. in help()) elegantly produce the "right result" with nicely named columns etc. I can't seem to make things work so smoothly. Thanks! Chip Barnaby --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

..., DP0$Key, function(x) weighted.mean(x$IAC, x$Wt)) : arguments must have same length How does one pass grouped arguments to processing functions such as weighted.mean() ? TIA, Chip Barnaby --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

...ot; cannot be coerced into a data.frame (although it seems to me that such a conversion could be usefully defined), so now I don't hit myself on the head with that particular hammer.) Chip Barnaby --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

...2.6424600 3.7197313 4.7970026 5.8742739 6.9515453 8 9 10 8.0288166 9.1060879 10.1833592 Warning message: 'newdata' had 7 rows but variable(s) found have 10 rows > --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com