search for: neagtiv

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2002 Nov 07
4
negative and positive values in diff. colors
...ion residuals as geodata points. I would like to display them in the following way: -negative values using pch=20 (filled circle) -positive values using pch=1 (empty circle) while using the cex.max=5, cex.min=0.1 for points() to represent the residuals value. Basically I would like to distinguish neagtive and positive values at my map. How to do this. Thanks in advance, Rado -- Radoslav Bonk M.S. Dept. of Physical Geography and Geoecology Faculty of Sciences, Comenius University Mlynska Dolina 842 15, Bratislava, SLOVAKIA tel: +421 2 602 96 250 e-mail: rbonk at host.sk -.-.-.-.-.-.-.-.-.-.-.-.-...
2006 May 18
1
Negatives density values (PR#8876)
...0 [13] 2.056151e-04 -1.407219e-16 -3.575895e-18 -1.979607e-16 [17] -1.574544e-17 -2.257917e-17 -2.305234e-16 4.052727e-18 > > #A plot of the "fluctuations" near zero > plot(result$x,result$y,type="l",xlim=c(-1,1),ylim=c(-10^-14,10^-14)) > abline(h=0) > > #All neagtives value of density are "near equal" to zero > all(apply(as.matrix(result$y[result$y<0]),1,all.equal, target=0)==TRUE) [1] TRUE > sessionInfo() R version 2.2.1, 2005-12-20, i386-pc-mingw32 attached base packages: [1] "methods" "stats" "graphics&...
2010 Aug 20
2
U value from wilcox.test
...compare the U value of the Mann-Whitney test to critical value for table rather than to rely on the p-value. Is W value correspond to U value ? >From the help I understand that W=U+m*(m+1)/2, is this true ? In the case it is, my U values would be U=W-6=-6!! I thought that a U value could not be neagtive. I would be happy to have any information about how to obtain the U value from the Mann-Withney test (wilcox.test()) in order to be able to compare it with table of critical U value commonly found. Thanks a lot for your time and help Have a nice day, Chlo? -- View this message in context: http...
2010 Jun 20
2
compute coefficient of determination (R-squared) for GLM (maximum likelihood)
Dear, I want to compute coefficient of determination (R-squared) to complement AIC for model selection of multivariable GLM. However, I found this is not a built-in function in glm. neither is it available through reviewing the question in the R-help archive. Please kindly help and thanks a lot. Elaine [[alternative HTML version deleted]]