On 26-Feb-09 12:58:49, Bob Gotwals wrote: > R friends, > > In a matrix of 1s and 0s, I'm getting a singularity error. Any helpful > ideas?
>From the degress of freedom in your output, it seems you are fitting 10 binary variables to a total of 23 observations. In such circumstances, it is not unlikely that the matrix of 0s and 1s representing the binary variables would have at least 1 column which can be represented as a linear combination of the others (which is what the "1 not defined because of singularities" means). Get more data, or use fewer variables! Or, also worth considering, check whether there are relationahips "in the real world" between your 10 variables which would tend to generate such linear dependence. Ted. > lm(formula = activity ~ metaF + metaCl + metaBr + metaI + metaMe + > paraF + paraCl + paraBr + paraI + paraMe) > > Residuals: > Min 1Q Median 3Q Max > -4.573e-01 -7.884e-02 3.469e-17 6.616e-02 2.427e-01 > > Coefficients: (1 not defined because of singularities) > Estimate Std. Error t value Pr(>|t|) > (Intercept) 7.9173 0.1129 70.135 < 2e-16 *** > metaF -0.3973 0.2339 -1.698 0.115172 > metaCl NA NA NA NA > metaBr 0.3454 0.1149 3.007 0.010929 * > metaI 0.4827 0.2339 2.063 0.061404 . > metaMe 0.3654 0.1149 3.181 0.007909 ** > paraF 0.7675 0.1449 5.298 0.000189 *** > paraCl 0.3400 0.1449 2.347 0.036925 * > paraBr 1.0200 0.1449 7.040 1.36e-05 *** > paraI 1.3327 0.2339 5.697 9.96e-05 *** > paraMe 1.2191 0.1573 7.751 5.19e-06 *** > --- > Signif. codes: 0 *** 0.001 ** 0.01 * 0.05 . 0.1 1 > > Residual standard error: 0.2049 on 12 degrees of freedom > Multiple R-squared: 0.9257, Adjusted R-squared: 0.8699 > F-statistic: 16.61 on 9 and 12 DF, p-value: 1.811e-05 > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -------------------------------------------------------------------- E-Mail: (Ted Harding) <ted.hard...@manchester.ac.uk> Fax-to-email: +44 (0)870 094 0861 Date: 26-Feb-09 Time: 15:07:40 ------------------------------ XFMail ------------------------------ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
