search for: yukangtu

Dear R experts, I had a question which may not be directly relevant to R but I will be grateful if you can give me some advices. I ran a two-level multilevel model for data with repeated measurements over time, i.e. level-1 the repeated measures and level-2 subjects. I could not get convergence using lme(), so I tried MLwiN, which eventually showed the level-2 variances (random effects for

Dear R users, If anyone can tell me how to extract the p values from the output of gee? Many thanks in advance. Yu-Kang _________________________________________________________________ §K¶O¸ÕÅ¥ MSN ­^»y¾Ç²ß¡G©M¯u¤H¦Ñ®v½u¤W¾Ç­^¤å http://www.msn.com.tw/english/

Dear R experts, My problem is as follows: Suppose I have a data frame d comprising two variable a<-c(1:10) & b<-c(11:20). I now want to select a subgroup according the values of b. I know if I just want to select, say, b=17, I can use f<-d[d$b==17] and R will give me > f a b 7 7 17 However, if now I want to select a subgroup according to b==e<-c(13,15,17), then the

Dear R experts, I want to extract standard error from the output of lme, but I found fix.effects() does not include SE of the coefficients. Many thanks in advance. Best regards, Yu-Kang _________________________________________________________________ ²{¦b´N¤W MSN ·|­û¥Ø¿ý¡G¦b½u¤Wµ²¥æ·sªB¤Í¡A§ä¨ì¿³½ì¬Û§ëªº¹Ù¦ñ

Dear R users, I used the multivariate random numbers generation function in MASS for my study. I wonder what is an approriate way to cite the library and its authors in my publication to express my gratefulness? best regards, Yu-Kang

Dear R users, I search the R archives and noted that the same problem has been posted but without solution. I know there IS instructions by the author of yags, but I just couldn't figured out. I know gee and geepack can also perform generalized estimating equation, but the reason why I need yags is I want to perform a Small Sample Adjustments by Michael P. Fay and Barry I. Graubard in

Dear R users, Can anyone tell me how to get the p value out of the output from summary.manova? I tried all the methods I can think of, but failed. Many thanks Yu-Kang _________________________________________________________________ ¥ß§Y¥Ó½Ð MSN Mobile ªA°È¡G¦b±zªº¤â¾÷¤W¦¬µo MSN Hotmail http://msn.com.tw/msnmobile

Dear R-users, I am a dentist (so forgive me if my question looks stupid) and came across a problem when I did simulations to compare a few single level and two level regressions. The simulations were interrupted and an error message came out like 'Error in MEestimate(lmeSt, grps) : Singularity in backsolve at level 0, block 1'. My collegue suggested that this might be due to my codes