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Dear All, I have a binomial response with one continuous predictor (d) and one factor (g) (8 levels dummy-coded). glm(resp~d*g, data, family=binomial) Y=b0+b1*X1+b2*X2 ... b7*X7 how can I get the...

Hello, how can one merge two data frames when in the second data frame one column defines the start values and another defines the end value of the to be merged range. data.frame.1 time ... 13 24 35 46...

Dear List, given a vecor of times in 5,15 and 30 minutes and a start point in time, lets say 09:30:00, how do I add up those times to the start time getting a cumulative time sequence...

Dear mixed modelers, If I have interactions between a categorical covariate and a random-effects grouping factor. How can I test formally the correlations? For example data(Machines, package = "MEMSS") fm2aM <- lmer(score ~ Machine + (0 + Machine|Worker), Machines) Random effects...

Dear List, I don't get scatter3d to color the sheres according to the '|' argument. library(car) scatter3d(prestige ~ income + education|type, data=Prestige) The spheres on my screen are all colored the same and they are not conditional on...

Dear All, when I'm running a PCA with prcomp(USArrests, scale = TRUE) I get the right principal components, but with the wrong sign infront Rotation: PC1 PC2 PC3 PC4 Murder 0.5358995 -0.4181809 0.3412327 0.64922780 Assault...

Dear Everybody: I want to test an interaction of two repeated measures in lmer() I've response times (Y) from N subjects with two within-subject-factors. aov(Y ~ A*B + Error(subjects/A*B), ...) shows an insigificant interaction p...

Dear R community, I've data-set with reaction times and count data (answers - yes, no) of N subjects under conditions A, B. For the analysis reaction time I used aov. fit.rt = aov(rt ~ A * B + Error(subjects/(A...

dear all, I want to make a dotplot with ratings from Items in 6 ItemsGroups. I reordered the items by rating within each group. I plotted the items by rating conditional on ItemGroup. The ordering works as I wanted but...

Dear all, How can I run a constrained correspondence analysis with the following data: 15 animals were measured repeatedly month-wise (over to 2 years) according to ther diet composition (8 food categories). our data.frame looks like this: food...

Thanks Michael, cumsum - yes of course! Regards, Ren? Zitat von "R. Michael Weylandt" <michael.weylandt at gmail.com>: > ? cumsum > > something like > > library(chron) # Reporting packages you use is always considerate > mt <- times(c('00:05:00', '00:15:00', '00...

Dear R-users, I have a complex line by xy-values (ordered by z). And I would like to get interpolated y-values on the positions of x = 0:600. How do I get the correct points? x=c(790...

Dear List, how can I draw the following path diagram A B C D E F \ | / \ | / G <--> H / \ / \ I J K L the problem I've got is that G and H need to be horizontally alingned but the best...

Dear List, I'm trying to draw vector in XYZ with rgl under use of a cylinder3d. Therefore I scale and rotate a basis-cylinder). However, somehow the rotation is wrong as verified by overplotting arrow3d(). Where is my mistake...

thanks for pointing out Paul, but the thing which is annoying me in the first place IS this direction reversal. this makes no sense for me why could this be? Zitat von "Paul Hiemstra" <paul.hiemstra at knmi.nl>: > Hi...

Dear John and Duncan, thanks for your ideas! Unfortunatly, calling spheres from rgl did not resolve the problem on my machine. Both - spheres3d() and rgl.spheres() - behave the same: black spheres, all aqual colored. The only difference beeing the looking...

Thanks again Gavin!, this is very clear and enlightening, vegan is an amazing package! It's a pleasure to use it. the best, Ren? -- Dr. Ren? Mayer Email: mayer at psychologie.tu-dresden.de Research Assistant Phone: +49-351-463...

Thanks a lot Gavin!, this was what I was looking for. Have I got this right that with no 'cyclic shifts *within* strata' you mean that I cannot define a nesting within animal, e.g., animal/year/season (speaking in...

Thanks Duncan! yes! this works; I paste the code in case someone wants to draw 3d-vectors with cylinders and cones. Ren? vector3D=function(start=c(0,0,0), end, mycol='green', cone.length=0.1, ... ){ # ... cylinder as basis-vector...

dear all, i'm trying to reproduce an spss-anova in R. It is an 2x3x3 repeated measures desingn with repeated contrasts. In R i've coded a contrast matrix for all factors and made a split in the aov...