similar to: (PR#7225) propogation of rounding error for t.tests with unequal sample sizes (PR#7225)

# users would benefit from a warning about the behavior in the # groups.unbalanced case below. A propogation of difference is the variance # calculation is leading to an apparently significant difference in # means, even though the numeric values are all identical. Obviously upon # inspection the difference in means is meaningless, but users might be warned # if all of the input data is

Hi, i'm looking for an R function to fit a one-way ANOVA with one factor containing 10 levels. The factor levels have different numbers of observations (varying between 20 to 40). For most of the dependent variables i'm testing there are unequal variances among the factor levels. I see the function oneway.test: oneway.test(variable ~ factor, data=dataset) which by default does not

Hi, all I have a rather un-ideal dataset that I am trying to work with, and would appreciate any advice you have on the matter. I have 4 years worth of data taken at 3 depth-zones from which samples have been taken at random. I am looking at the abundance of organism A between depth zones and across years, and am interested in the possible interaction of organism A distributions shifting

Hi, I am trying a two way anova with unequal sample sizes but results are not as expected: I take the example from Applied Linear Statistical Models (Neter et al. pp889-897, 1996) growth rate gender bone development 1.4 1 1 2.4 1 1 2.2 1 1 2.4 1 2 2.1 2 1 1.7 2 1 2.5 2 2 1.8 2 2 2 2 2 0.7 3 1 1.1 3 1 0.5 3 2 0.9 3 2 1.3 3 2 expected results are

Hi All, I was looking into MachineCopyPropagationPass.ccp file in llvm, which in first look, looks likes to me doing only redundant copy elimination in same basic block. I am interested in any pass which is doing copy propogation across the basic block in a function. Let me know if any such pass exist ? Thanks, Deepali -------------- next part -------------- An HTML attachment was scrubbed...

I am using R for the first time in one of my classes. My students have alerted me to a problem for which we have not found an answer. We find that some means returned by the model.tables function are not correct when missing data is present in analysis of variance problems. We have duplicated the problem using R 1.2.0, 1.2.1, and 1.2.2 under Windows 98 and several distributions of Linux (Redhat

Hi R-help members, I have read a lot in the Archive about the "Type I" vs "Type III" sum of square. I think I have read confusing post so I want to have a clear idea of the problem. Here is an example. I have 3 groups of subjects of unequal sample size (G1 (n=7), G2 (n=7), G3 (n=4)). for Each subject I have 4 measures corresponding to the crossing of 2 factor (A & B)

Hi! I am using R 1.8.1 and the svm of the e1071 package for classification. The problem is that I have unbalanced classes e.g. the first one is much bigger than the second one and therfore the svm is biased to the first class. If I manually adjust the class size the bias disappears. The question is then how to include this unequal class distribution to the svm (e.g. via wheights or costs)?

Hi everyone! I need to perform a Wilcoxon rank sum test, but I have some ties and the groups have different size also. When I deal with ties I use the wilcox.exact function, how can I solve the different size problem using this function? thanks net -- View this message in context: http://r.789695.n4.nabble.com/Wilcoxon-rank-sum-in-unbalanced-design-tp3447400p3447400.html Sent from the R help

Hello, For an experiment, I selected plots of land within a forest either with honeysuckle or without honeysuckle. Thus, my main factor is fixed, with 2 levels: "honeysuckle present"(n=11) and "honeysuckle absent"(n=8). Within each plot of land, I have a "trenched" subplot and an "untrenched" subplot. Within each subplot of every plot, I measured soil

In Baron and Li's "Notes on the use of R for psychology experiments and questionnaires" http://cran.r-project.org/doc/contrib/rpsych.htm they describe a balanced data set for a drug experiment: "... a test of drug treatment effect by one between-subject factor: group (two groups of 8 subjects each) and two within-subject factors: drug (2 levels) and dose (3 levels). "

Hello, All services have been successfully migrated to our new facility. Unfortunately, NetSol once again displayed a brilliant inability to grasp a clue using both hands and a suction cup, and informed us they *might* get around to updating DNS records in about two weeks. If we could fax them enough identification. Needless to say, they've lost our business and our domain transfers should

Hello, All services have been successfully migrated to our new facility. Unfortunately, NetSol once again displayed a brilliant inability to grasp a clue using both hands and a suction cup, and informed us they *might* get around to updating DNS records in about two weeks. If we could fax them enough identification. Needless to say, they've lost our business and our domain transfers should

Hello, All services have been successfully migrated to our new facility. Unfortunately, NetSol once again displayed a brilliant inability to grasp a clue using both hands and a suction cup, and informed us they *might* get around to updating DNS records in about two weeks. If we could fax them enough identification. Needless to say, they've lost our business and our domain transfers should

Hello, All services have been successfully migrated to our new facility. Unfortunately, NetSol once again displayed a brilliant inability to grasp a clue using both hands and a suction cup, and informed us they *might* get around to updating DNS records in about two weeks. If we could fax them enough identification. Needless to say, they've lost our business and our domain transfers should

Hello, All services have been successfully migrated to our new facility. Unfortunately, NetSol once again displayed a brilliant inability to grasp a clue using both hands and a suction cup, and informed us they *might* get around to updating DNS records in about two weeks. If we could fax them enough identification. Needless to say, they've lost our business and our domain transfers should

Hello, All services have been successfully migrated to our new facility. Unfortunately, NetSol once again displayed a brilliant inability to grasp a clue using both hands and a suction cup, and informed us they *might* get around to updating DNS records in about two weeks. If we could fax them enough identification. Needless to say, they've lost our business and our domain transfers should

Hello Les, Thanks for that info. I'm playing with this now and although the 'failover' process seems rather slow, it does seem to be doing what I need. I setup a subdomain entry to point to 4 IP's, only one if which is actually working, and indeed, when IE get's a non-active IP, it eventually goes to the next one until it finally finds the actual live IP. Once it gets the

Dear R community, I tried to optimized my R code by using Rprof. In my R code I'm using MySQL database connections intensively. After a bunch of queries R fails with the following error message: Error in .Call("RS_MySQL_newConnection", drvId, con.params, groups, PACKAGE = .MySQLPkgName) : RS-DBI driver: (could not connect mylogin@mydatabase on dbname "myDB"

I have a three-way unbalanced ANOVA that I need to calculate (fixed effects plus interactions, no random effects). But word has it that aov() is good only for balanced designs. I have seen a number of different recommendations for working with unbalanced designs, but they seem to differ widely (car, nlme, lme4, etc.). So I would like to know what is the best or most usual way to go about working