search for: olshen

Full_Name: Adam B. Olshen Version: 1.3.1 OS: Linux Submission from: (NULL) (140.163.222.233) There appears to be a bug with write.table if the object being written is a matrix. Specifically, the option row.names=F gives an error. I have seen this problem repeated in the Windows implementation. An example is below. A...

Hi All: Has anyone analyzed Illumina 550K data using DNAcopy package? I have around 2300 samples. According to Venkatraman and Olshen 2007 paper, it needs about 25 min to run a single sample for Affymetrix 100K. I am afraid it will take too long to analyzed my data. Anybody has an idea? Thanks! Best, -- View this message in context: http://www.nabble.com/DNAcopy-package-in-R-tp23158907p23158907.html Sent from the R help mailin...

Apologies for cross posting.... --------------------------------------------------------------------- CART Data Mining'04: First International CART(R) Conferences Focusing on the Data Mining technology of Leo Breiman, Jerome Friedman, Richard Olshen, Charles Stone (CART, MARS(R), TreeNet(tm), PRIM(tm)...) First Call For submissions --------------------------------------------------------------------- US Venue: San Francisco, March 23-25, 2004 EU Venue: Madrid, May 25-26, 2004 Conference...

...Homepage: http://www.cartdatamining.com Detailed Conference Schedule: http://www.cartdatamining.com/program.htm Registration (San Francisco): http://www.cartdatamining.com/RegCART04.pdf ** OPENING SESSION, Monday March 22nd, 7:30 PM Personal recollections of Leo Breiman, Jerome Friedman, Richard Olshen, Charles Stone. Join us to hear Breiman, Friedman, Olshen and Stone discuss their early research interests and trace the ideas, decisions, and chance events that culminated in CART, their landmark work. ** Join us for John Elder's popular presentation: "Top Ten Data Mining Mistakes (with...

...ning, and statistics. The session will focus on some of Breiman's lesser known innovations that may be influential in the future. Speakers will include: - Richard Carson, University of California, San Diego - Adele Cutler, Utah State University - Jerome Friedman, Stanford University - Richard Olshen, Stanford University - Chuck Stone, University of California, Berkeley - Rob Tibshirani, Stanford University The Conference, which continues on March 30-31, will include many papers on CART(R), Bagging, RandomForests(tm), as well as MARS(R), TreeNet(tm), and other topics related to the more rece...

...f Other deadlines: Paper Submission: January 12th Student Contest: January 10th --------------------------------------------------------------------- CART Data Mining'04: First International CART(R) Conferences Focusing on the Data Mining technology of Leo Breiman, Jerome Friedman, Richard Olshen, Charles Stone (CART, MARS(R), TreeNet(tm), PRIM(tm)...) --------------------------------------------------------------------- US Venue: San Francisco, March 22-24, 2004 EU Venue: Madrid, May 11-12, 2004 Conference home page: http://www.cartdatamining.com ---------------------...

Can I say that RPART is a modified algo of CART and PARTY a modified of CHAID? Thanks. ---- Chua Siang Li Consultant - Operations Research Acceval Pte Ltd Tel: 6297 8740 Email: siang.li.chua at acceval-intl.com Website: www.acceval-intl.com This message and any attachments (the "message"...{{dropped:12}}

I was under the impression that the tree method (e.g. as implemented in rpart) was insensitive to monotonic transformations of the dependent variable. e.g. Breiman Olshen et al. Classification and Regression Trees state "In a standard data structure [a tree] is invariant under all monotone transformations of individual ordered varaibles" (p. 57) However, I get very different results from tr.hh.pri <- rpart((log(YPRISX+1)~AGE+DRUGUSEY+SEX+OBSXNUM)) an...

...e right, improve=0.03620793, (1 missing) age < 75.5 to the right, improve=0.01606491, (0 missing) Surrogate splits: ph.ecog < 1.5 to the right, agree=0.787, adj=0.392, (3 split) age < 72.5 to the right, agree=0.680, adj=0.089, (0 split) In Breiman, Friedman, Olshen, & Stone, the canonical CART book, the pat.karno variable would get .0366 "points" for this split, ph.ecog would get .0366 * .392 points age would get .0366 * .089 points The reason for adding in surrogates is to account for redundant variables. Suppose for instance that x1=heig...

Hello, I'm using mvpart option xv="1se" to compute a regression tree of good size with the 1-SE rule. To better understand 1-SE rule, I took a look on its coding in mvpart, which is : Let z be a rpart object , xerror <- z$cptable[, 4] xstd <- z$cptable[, 5] splt <- min(seq(along = xerror)[xerror <= min(xerror) + xvse * xstd]) I interprete this as following: the

...w.salforddatamining.com/docs/schedule06.pdf <http://www.salforddatamining.com/docs/schedule06.pdf> *Conference Highlights:* * State-of-the-Art Research from Leading Academic Institutions: Keynote Presentations by Adele Cutler, co-creator of Random Forests, and Richard Olshen, Chief, Division of Biostatistics, Stanford Medical School and CART co-creator. * Networking Opportunities with Business and Technology Peers: Attendees at Prior Conferences included The International Monetary Fund, Barnes and Noble, Pfizer, Union Bank, Wells Fargo, Cip...

I have a data set w/ an ordinal response taking on one of 10 categories. I am considering using polr to fit a cumulative logits model. I previously fit the model in SAS (using proc logistic) which provides a test for the proportional odds assumption (p < 0.001 for the test). Are there simple diagnostic plots that can be used to look at the validity of this assumption and possibly help w/

Hello. I have a hudge problem, don't know how to deal with it... I'm supposed to implement a tree structure in R, without using rpart library... I don't have any clue about appropriate approach... Anyway, I can't use pointers under R...so how to to it? lists, vectors... Anyway, does anybody knows how the regression tree in rpart was implemented... Someone please help! Thanks, ana

Dear R-helpers, I had a conversation with a guy working in a "business intelligence" department at a major Spanish bank. They rely on recursive partitioning methods to rank customers according to certain criteria. They use both SAS EM and Salford Systems' CART. I have used package R part in the past, but I could not provide any kind of feature comparison or the like as I have no