search for: iii

...uncommon to want to coarsen a factor by grouping levels together. I have found one way to do this in R: > sites [1] F A A D A A B F C F A D E E D C F A E D F C E D E F F D B C Levels: A B C D E F > regions <- list(I = c("A","B","C"), II = "D", III = c("E","F")) > library(Epi) > region <- Relevel(sites,regions) > region [1] III I I II I I I III I III I II III III II I III I III [20] II III I III II III III III II I I Levels: I II III However this seems like using a sledgehammer...

Hi all, I have been trying to calculate Type III SS in R for an unbalanced two-way anova. However, the Type III SS are lower for the first factor compared to type I but higher for the second factor (see below). I have the impression that Type III are always lower than Type I - is that right? And a clarification about how to fit Type III SS. Fitt...

Dear all, Type III SS time again. This case trying to reproduce some SPSS (type III) data in R for a repeated measures anova with a betwSS factor included. As I understand this list etc, if I want type III then I can do library(car) Anova(lm.obj, type="III") But for the repeated measures anova, I need t...

I should hope that there is trouble, since "type III" is an undefined concept for a Cox model. Since SAS Inc fostered the cult of type III they have recently added it as an option for phreg, but I am not able to find any hints in the phreg documentation of what exactly they are doing when you invoke it. If you can unearth this information,...

...evels - map, syc, and oak cond.time has two levels - 30 and 150. There are no response values for Map-150, so that entire, two-way, level is missing. When running anova() on the model with Type I SS, the full factorial design does not return errors; however, using package:car Anova() and Type III SS, I receive an singularity error unless I used the argument 'singular.ok = T' (it is defaulted to F). So, why don't I receive an error with anova() when I do with Anova(type = "III")? How do anova() and Anova() handle incomplete designs, and how can interactions of vari...

Hello, I use a type III anova ("car" package) to analyse an unbalanced data design. I have two factors and I would have the effect of the interaction. I read that the result could be strongly influenced by the contrasts. I am really not an expert and I am not sure to understand indeed about what it is... Con...

Hello, I believe the aov() function in R uses a "Type-I sum-of-squares" by default as against "Type-III". This is relevant for me because I am trying to understand ANOVA in R using my knowledge of ANOVA in SPSS. I can only reproduce the results of an ANOVA done using R through SPSS if I specify that SPSS uses a Type-I sum-of-squares. (And yes, I know that when the sample sizes of all groups ar...

Hello, as far as I see, R reports type I sums of squares. I'd like to get R to print out type III sums of squares. e.g. I have the following model: vardep~factor1*factor2 to get the type III sum of squares for factor1 I've tried anova(lm(vardep~factor2+factor1:factor2),lm(vardep~factor1*factor2)) but that didn't yield the desired result. Could anyone give me a hint how to proceed?...

Hi everyone, Can someone explain me how to calculate SAS type III sums of squares in R? Not that I would like to use them, I know they are problematic. I would like to know how to calculate them in order to demonstrate that strange things happen when you use them (for a course for example). I know you can use drop1(lm(), test="F") but for an lm(y~A+...

I am trying to reproduce an analysis done in SAS from which Type III Sums of squares are used. How can you get Type III sums of squares in an aov similar to what SAS provides? With best wishes and kind regards I am Sincerely, Corey A. Moffet Instructor Department of Range, Wildlife, and Fisheries Management Mail Stop 2125 Texas Tech University Lubbock, Texas 794...

...g styles for data that already exist, and if someone could direct me to them? Inclded is a sample code and 2 possibilities (others welcome for consideration) of how I want to display some data. Thanks, Matt ----- df <- data.frame( f1=rep(c("Maj I", "Maj II", "Maj III"), each=3), f2=c("Minor A", "Minor A", "Minor A", "Minor A", "Minor B", "Minor B", "Minor B", "Minor C", "Minor C") ) ----- What I want printed is something like: ------------------- f1...

Did you ever resolve your problem with Warcraft III? I'm having the same problem. Michael Gerst 21-H-05 One ATT Center Saint Louis, MO 63101 314-235-5443 RESTRICTED-PROPRIETARY INFORMATION The information contained herein is for use only by authorized employees of AT&T Services, Inc., and its authorized affiliates. It is not for gener...

...fy it. I have a dataset from 23 males and 18 females. I measured one condition('cond') with 4 levels. So I'd like to see main effect of gender, cond and gender by cond interaction and also postHoc test. (In fact, I have to do anova 90 times) * 1. Question about constrast stuff for type III* After googling, I found a document ( https://stat.ethz.ch/pipermail/r-help/2001-October/015889.html) and it looked like make sense. This below is what I did on R and I encountered 'error message'. library(car) results_lmanova <- list() for(i in 1:90) {sum=subset(ast.ast_coef, ast.ast_c...

Hi. I have a character vector that looks like this: > temp <- c("Company name: The first company General Manager: John Doe I > Managers: John Doe II, John Doe III","Company name: The second company > General Manager: Jane Doe I","Company name: The third company Managers: > Jane Doe II, Jane Doe III") > temp [1] "Company name: The first company General Manager: John Doe I Managers: John Doe II, John Doe III" [2] &qu...

I am running a two-way anova with Type III sums of squares and would like to be able to understand what the different SS mean when I use different contrasts, e.g. treatment contrasts vs helmert contrasts. I have read John Fox's "An R and S-Plus Companion to Applied Regression" approach -p. 140- suggesting that treatment contra...

Hello. On a PC Pentium III I had a audio server working properly with Icecast2 and Ices2, running on Debian 5.0 (Lenny). Now I've upgraded to Debian 6.0 (Squeeze) and after a few seconds of running everything correctly, successive cuts begin to occur in the audio. For Debian 6.0 I have used the same settings for Icecast2...

To whom it may concern I made some analysis with R using the command Anova. However, I found some problmes with the output obtained by selecting type II o type III sum of squares. Briefly, I have to do a 2x3 mixed model anova, wherein the first factor is a between factor and the second factor is a within factor. I use the command Anova in the list below, because I want to obtain also the sum of squares of the linear and quadratic contrast between the lev...

Hello All, Am having some trouble computing Type III SS in a Cox Regression using either drop1 or Anova from the car package. Am hoping that people will take a look to see if they can tell what's going on. Here is my R code: cox3grp <- subset(survData, Treatment %in% c("DC", "DA", "DO"), c("PTNO", &quo...

...for(BasicBlock::iterator II = BI->begin(),IE = BI->end();II != IE; ++II) { // we only care the instruction that call for functions and it can be cast to CallInst if(CallInst * III = dyn_cast<CallInst>(II)) { // if the callInst is calling for puts function if(III->getCalledFunction()!=NULL&&III->getCalledFunction()->getName()==&quo...

Hello R-users, I am trying to obtain Type III SS for an ANOVA with subsampling. My design is slightly unbalanced with either 3 or 4 subsamples per replicate. The basic aov model would be: fit <- aov(y~x+Error(subsample)) But this gives Type I SS and not Type III. But, using the drop() option: drop1(fit, test="F") I get an erro...