search for: methoda

Hi R mailing list Does anyone know of a good way to conditionally evaluate R code chunks when Sweaveing? What I'd kind of like to be able to do is set a number of variables in a list and if variable.a=TRUE then process code chunk labelled "methodA", if variable.b=TRUE then process code chunk labelled "methodB" etc <<label=setvars>>= variable.a <- TRUE variable.b <- FALSE ##etc @ if (varible.a == TRUE) { <<label=methodA>>= R code for method A goes in here more R code @ } if (varible.b == TRUE) {...

Hi I need to compare the performance of two sludge inertization methods. For that i want make a manova Wilks test. Description of the experiment: After the calcination at different temperatures my calcinated sludge are submeted to the lixiviation test. In my tables i show the concentration of the some elements in the extract phase. The results: Method A (calcination at 1100 C) Chromium

...06 *** x2 0.13596 0.11563 1.176 0.2507 #ref=b dat$method <- relevel(dat$method, ref="b") lm_ref_b<-lm(y~method + x1 + x2) summary(lm_ref_b) Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) 1.24591 0.73770 1.689 0.1037 methoda -0.32389 0.14025 -2.309 0.0295 * methodc -0.65705 0.13248 -4.960 4.14e-05 *** In summary: idea1: a vs b:pvalue=0.0000001 a vs c:pvalue=0.0000002 b vs c:pvalue=0.8578386 idea2: a vs b:pvalue=0.0683 a vs c:pvalue=0.2069 b vs c:pvalue<0.001 idea3: a vs b:pvalue=0.0295 a vs c:p...