similar to: multinomial logit estimation

Good morning, Does anyone know of a package or function to do a beta regression? Thanks, Walt Paczkowski _________________________________ Walter R. Paczkowski, Ph.D. Data Analytics Corp. 44 Hamilton Lane Plainsboro, NJ 08536 (V) 609-936-8999 (F) 609-936-3733

Good morning, Is it possible to open an html file using IE but from within R? I wrote a small function to generate tables in html but I'd like to write another function to call IE and open the html file. Thanks, Walt Paczkowski ________________________ Walter R. Paczkowski, Ph.D. Data Analytics Corp. 44 Hamilton Lane Plainsboro, NJ 08536 (V) 609-936-8999 (F) 609-936-3733

Hi, I'm attempting to use the RODBC package on Windows Vista to import an excel spreadsheet. The spreadsheet has three worksheets the last of which is blank. Following an example in Phil Spector's book (p. 34), after creating a connection named con I did the following: > con RODBC Connection 3 Details: case=nochange DBQ=c:\temp\test.xls DefaultDir=c:\temp

Hi, I'm hoping someone has a suggestion for handling a simple problem. A client gave me a comma separated value file (call it x.csv) that has an id and name and address for about 25,000 people (25,000 records). I used read.table to read it, but then discovered that there are stray carriage returns on several records. This plays havoc with read.table since it starts a

Hi, I wrote a simple master function, run(), that has inside six qplot functions. The goal is to type run() and have all six graphs appear as separate windows so that I can copy them into PowerPoint for a client. When I type run(), only the last graph appears, the first five apparently being overwritten. How do I get all six in separate windows, ready for copying? By the way, is the a way

I want to get the logLik to calculate McFadden.R2 ,ML.R2 and Cragg.Uhler.R2, but the value from multinom does not have logLik.So my quetion is : is logLik meaningful to multinomial logistic model from multinom?If it does, how can I get it? Thank you! ps: I konw VGAM has function to get the multinomial logistic model with logLik, but I prefer use the function from "official" R

Hi, I have an upcoming project that will involve a large text file. I want to 1. read the file into R one line at a time 2. do some string manipulations on the line 3. write the line to another text file. I can handle the last two parts. Scan and read.table seem to read the whole file in at once. Since this is a very large file (several hundred thousand lines), this is not

Hi, I want to view the code for the function confint in the stats package. Typing just confint doesn't work. How can I view the code? Thanks, Walt ________________________ Walter R. Paczkowski, Ph.D. Data Analytics Corp. 44 Hamilton Lane Plainsboro, NJ 08536 ________________________ (V) 609-936-8999 (F) 609-936-3733 walt at dataanalyticscorp.com www.dataanalyticscorp.com

Good morning, I keep copies my .RData file in different directories for different projects on Windows XP. There is an icon on my desktop for each project so all I have to do is click on the icon to open R for a specific project, i.e. a specific .RData file. How do I change to another .RData file from within R without first closing R? Thanks, Walt Paczkowski

Hi, A client has a consumption measure on each of four products. The sample size is 75. The consumption distributions are highly skewed for each product. He would like a pairwise comparison test of the products, much like Tukey's HSD but using medians rather than means. Is there such a median comparison test in R? Thanks, Walt ________________________ Walter R. Paczkowski, Ph.D.

Hi, I attempted to install Rgraphviz but ran into a problem. It requires graphviz 2.20.3. I have this and installed it but the Windows 7 system path variable has to be modified to include the path to the graphviz bin file. How do I do this on Windows 7? It's been a long time since I had to change the path variable. Thanks, Walt ________________________ Walter R. Paczkowski, Ph.D.

Hi, I have a simple question. Suppose I have a string "x$Expensive". I want to find the position of the $ in this string; i.e., I want a function that returns 2. I tried grep, regexpr, etc with no luck, unless I'm just using them incorrectly. Any suggestions? Thanks, Walt ________________________ Walter R. Paczkowski, Ph.D. Data Analytics Corp. 44 Hamilton Lane Plainsboro,

Dear All I am trying to fit a multinomial logistic regression to a data set with a size of 94279 by 14 entries. The data frame has one "sample" column which is the categorical variable, and the number of different categories is 9. The size of the data set (as a csv file) is less than 10 MB. I tried to fit a multinomial logistic regression, either using vglm() from the VGAM package or

Hi, I'm struggling with foreign to import a SAS file. The file, for lack of imagination, is d.sas7bdat and is in my root directory (c:\) under Windows XP. When I type read.ssd("c:\\", "d") which I think I'm suppose to enter, I get SAS failed. SAS program at C:\DOCUME~1\Owner\LOCALS~1\Temp\Rtmp32758\file19621.sas The log file will be file19621.log in the current

Good morning, I'd like to look at the code for the R function head. When I type just the word head, I get back function(x, ...) UseMethod("head") <environment: namespace:utils> I expected to see several lines of R code. Any suggestions? Thanks, Walt Paczkowski

Hi, I started playing around with a function for using StatTransfer (version 10) for importing data. This started as a simple task but it's not working and so now I'm very frustrated. I'm using R version 2.13 on Windows 7. The function, called fn.importData, is: function(file = NULL, type = NULL){ ## ## create statTransfer command file -

Dear all, I am new to R and would like to run a multinomial logistic regression on my dataset (3 predictors for 1 dependent variables) I have used the vglm function from the VGAM package and got some results. Using the predict() function, I obtained the probability table I was looking for. However, I would like to fully understand how the predict() function generates the probabilities or in

Hi, Is there a way to create a list of all statistical test functions in base R? For example, there's t.test, ks.test, chisq.test, etc. I'd like to create a list of these test names because I keep looking for different tests but never know what's available. I'm thinking of a regular expression statement but I'm not sure how this would work for functions. Or is there a

Hi, I have a discrete choice model to estimate for a client that I originally planned to estimate as an aggregate model using a clogit routine. Now the client is asking for results for many segments of the respondents which would mean, if I stayed with my original plan, I would have to estimate a large number of models. I could certainly do this, but I'm thinking that it would be

Good morning, I use SAS and R/S-Plus as my primary tools so I have a lot of experience with these programs. By far and away, SAS is superior for handling the "messy" datasets, but also the very large ones. I work at times with datasets in the hundreds of thousands (and on occasion, millions) of records. SAS, and especially PROC SQL, are invaluable for this. But once I get to