search for: iiis

Displaying 20 results from an estimated 3171 matches for "iiis".

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2005 Sep 08
1
Coarsening Factors
It is not 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 <-
2008 Sep 26
1
Type I and Type III SS in anova
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. Fitting model<-aov(y~a*b) in the base package and
2004 Aug 26
1
library(car) Anova() and Error-term in aov()
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 to include an Error-term in the aov() call (Psychology-guide from Jonathan Baron)
2013 Apr 24
2
Trouble Computing Type III SS in a Cox Regression
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, then I will be happy to tell you whether
2012 Jun 15
1
How do anova() and Anova(type="III") handle incomplete designs?
Hello all: I am confused about the output from a lm() model with an incomplete design/missing level. I have two categorical predictors and a continuous covariate (day) that I am using to model larval mass (l.mass): leaf.species has three levels - 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.
2004 May 07
1
contrasts in a type III anova
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... Consequently, I failed to properly used the fit.contrast function (gregmisc
2010 Mar 01
5
Type-I v/s Type-III Sum-Of-Squares in ANOVA
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
2003 Mar 06
6
type III Sum Sq in ANOVA table - Howto?
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?
2005 Nov 24
2
type III sums of squares in R
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+B+A:B), type III SSQs are only
2002 Jan 28
4
Type III Sums of Squares
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 79409-2125 (806) 742-2843 Voice
2010 Oct 29
2
Printing data.frame data: alternatives to print?
Hi, I have a data frame with two factors (well, more, but 2 for simple consideration), and I want to display the different combinations of the them that actually occur in the data. In reality, there are too many of them to do to do a 'table' call and have one col vertical and one col horizontal (I don't want any of the factors listed horizontally). Before I try to write a function
2006 Aug 04
2
Warcraft III won't run
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 general distribution within or outside the respective
2010 Oct 20
1
Please help: ANOVA with SS Type III for unequal sample sized data
Dear R experts, I'm beginner. My question about ANOVA for unequal sample sized data should be obsolete but I can not clarify 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
2011 May 04
2
split character vector by multiple keywords simultaneously
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
2007 Oct 11
2
Type III sum of squares and appropriate contrasts
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 contrasts do not usually result in meaningful results with Type
2012 Aug 29
2
Icecast2 and Ices2 on Pentium III with Debian 6.0
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 and Ices2 I used in Debian 5.0. Increasing "burst" only managed
2012 Mar 21
2
Type II and III sum of squares (R and SPSS)
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
2013 Apr 24
1
Trouble Computing Type III SS in a Cox Regression using drop1 and Anova
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", "Treatment", "PFS_CENSORED",
2012 Apr 10
4
[LLVMdev] How to explain this weird phenomenon????????
My friends, I ran a function pass on a .bc file, intending to insert a CallInst to my self-made check function. The compilation is successful. BUT after I ran that pass on the .bc file, the size of the file didn't get any bigger!! Does this mean my instrumentation work failed?? BTW the opt command I use is "opt -load ../../../Debug+Asserts/lib/Hello.so -hello <hello.bc> -o
2011 May 21
2
unbalanced anova with subsampling (Type III SS)
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 error message: "Error in