search for: antai

...an Mixture Model , which is a mixture modeling method that is widely used in statistical learning theory. I know there is a mclust, however, I think it is a little bit different from my problem. Thanks very much.. regards. -------------------------- Peng Jiang ?? Ph.D. Candidate Antai College of Economics & Management ???????? Department of Mathematics ??? Shanghai Jiaotong University (Minhang Campus) 800 Dongchuan Road 200240 Shanghai P. R. China

Dear R experts, i have a vector z , i have to do something after z is sorted. how can i find the original index, i.e., before sorting, of a certain element in the sorted vector . thanks in advance regards ----------------------------------------------- Peng Jiang ?? ,Ph.D. Candidate Antai College of Economics & Management ???????? Department of Mathematics ??? Shanghai Jiaotong University (Minhang Campus) 800 Dongchuan Road 200240 Shanghai P. R. China

...ecoverable: exiting now > > is it because all the downloading error or something else ? > > I am running Mac OS X 10.5.3 with R 2.7.1. > > thanks in advance. > > best regards > > ----------------------------------------------- > Peng Jiang (江鹏), Ph.D. Candidate > Antai College of Economics & Management 安泰经济管理学院 > Department of Mathematics 数学系 > Shanghai Jiaotong University (Minhang Campus) > 800 Dongchuan Road > 200240 Shanghai > P. R. China > ----------------------------------------------- Peng Jiang 江鹏 ,Ph.D. Candidate Antai College of Ec...

...llowing warnings " Error in nlm(foo, theta.start) : non-finite value supplied by 'nlm' " I don't know why ,can anybody give me some hints ?? thanks in advance. regards . _______________________ Jiang Peng, Ph.D. Candidate Department of mathematics & Antai college of Economics and management Shanghai Jiao Tong University Address: Room 127, #3 Building, Xuhui Campus E-mail: jp021 at sjtu.edu.cn jp021 at 126.com MSN: jp021 at hotmail.com iChat: mathfrog at mac.com Mobile: +86-138 168 780 95

Hi, dear R experts . is there any package contain an universal EM procedure, that is , for arbitrary d.f. , not just the one in mclust . thanks in advance best regards ----------------------------------------------- Peng Jiang ?? ,Ph.D. Candidate Antai College of Economics & Management ???????? Department of Mathematics ??? Shanghai Jiaotong University (Minhang Campus) 800 Dongchuan Road 200240 Shanghai P. R. China

...have a function to optimize . alpha = argmin{ f(x,alpha) } I want alpha to be in [0,1]. Is there any function that can work? I use nlm() but i can't fix the domain of alpha. thanks in advance _______________________ Jiang Peng, Ph.D. Candidate Department of Mathematics & Antai college of Economics and Management Shanghai Jiao Tong University Address: Room 127, #3 Building, Xuhui Campus E-mail: jp021 at sjtu.edu.cn jp021 at 126.com MSN: jp021 at hotmail.com iChat: mathfrog at mac.com Mobile: +86-138 168 780 95

...tasets methods base other attached packages: [1] mclust_3.1-5 x <- rnbinom(100, mu = 10, size = 10) hdev <- function(par) { -sum(dnbinom(x, mu = par[1], size = par[2], log = TRUE)) } nlminb(c(9, 12), hdev) ----------------------------------------------- Peng Jiang 江鹏 ,Ph.D. Candidate Antai College of Economics & Management 安泰经济管理学院 Department of Mathematics 数学系 Shanghai Jiaotong University (Minhang Campus) 800 Dongchuan Road 200240 Shanghai P. R. China [[alternative HTML version deleted]]

Hi,Dear all R experts, I am trying to do the 2-way contingency table analysis by fitting the loglinear models. However, I found my table has several empty cells which are theoretically missing values.I have no idea of how to solve them coz we cannot compute the simulated p-value with zero marginals.Does someone have some suggestions? Please help me out, thanks a lot! Cheers, Yan

Hi all, I am a biological student and need your help in statistics. I have two sets of binomial distributed numbers: {a1, a2, ..., an} and {b1, b2, ..., bn}. How can I get the distribution of the ratios of the two sets of numbers {a1/b1, a2/b2, ..., an/bn}? Is there a formula to transform the distributions? Or where I can start if I want to learn necessary techniques? Thank you a lot! xiechao

...from time to time( If I ran the code second time , it does not have the error .) I am new to R so I don't know if there is any debug method of R code. i hope somebody can help me out . Thanks in advance. ------------------------ Jiang Peng, Ph.D. Candidate Department of mathematics & Antai college of Economics and management Shanghai Jiao Tong University Address: Room 127, #3 Building, Xuhui Campus E-mail: jp021 at sjtu.edu.cn jp021 at 126.com MSN: jp021 at hotmail.com iChat: mathfrog at mac.com Mobile: +86-138 168 780 95

Hi, Is the following function built in somewhere? concat = function(v) { res = "" for (i in 1:length(v)) res = paste(res,v[i],sep="") res } e.g. > concat(c("12","3","45")) [1] "12345" Cheers, Andy -- Andy Fugard, Postgraduate Research Student Psychology (Room F3), The University of Edinburgh, 7 George

I'm trying to do realize the following: I have 4 condtions. If all conditions are satisfied I will paste("PASS") If any of these is not satisfied I will paste("FAIL"). But I have to paste the corresponding failure. ifelse is a good solution but for a 2 conditions. Maybe switch or something like this. Does anyone have an idea how to do? Thanks in advance. Adel -- View

Hello there. Is there any function in R that can do cluster on a set of data that has both categorical and numerical variables? thanks. siangli

Hello. Somebody knows how can I generate a set of n random vectors of a normal distribution of several variables? For example, I want to generate n=100 random vectors of two dimensions for a normal with mean c(0,1) and variance matrix: matrix(c(2,1,1,3),2,2). Thanks in advance, Arnau.

Dear R Users, I would like to plot three time series on the same graph, two axis on the left and one axis on the right. The time series that I am graphing on the left do not share a similar scale: one has a range of 1:100 and the other a range of 25000:70000. How can I display the tick marks for both on the left hand side without superimposing them, i.e. one set of tick marks in black right