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thanks to all those who replied to my request for a program to carry out decision or risk analysis, as at the moment i am only interested in drawing the graphical trees, no decisions will be made on the figures, as the outcomes in the data set are already fixed. If anyone knows of a simple package that will do this , please let me know , i could always use a word processing package and a calculator!! You will see some of the replies relate to specific products - i have just forwarded the replies to the list and as i have not examined all the options yet cannot comment on any - apart from the general comment in the first paragraph 1.Books on Excel produced by Thomson learning (Duxbury) have Excel bolt-ons which come free with the books on eof which has a decision tree module. Since the books cost about £25 getting the bolt-ons (which also include other useful bits and bobs) is a bonus. And, no, I am not a Thomson Rep. Colin Chalmers 2. Check out Paul Jensen's page at UT Austin at: http://www.me.utexas.edu/~jensen/jensen.lib/index.htm It appears that he has an add in that does what you want with decision trees. Paul is a friend of a friend who pointed out that it was a site well worth visiting. Note that the add ins are free. He develops them as part of his teaching and shares them at no cost. Regards, Doug Matheson 3.I'm not sure exactly what you want, but the CHAID (Chi-Squared Automatic Interaction Detector) creates a tree based on a binary response, such as Disease / Non-Disease, with splits defined by your covariates (e.g. exposure to hazard etc.). It can also cope with multi-level responses (such as no disease, mild disease, moderate, severe). I'm a bit out of date with this but a good start would be SPSS - they used to provide CHAID and Ansatree packages but I heard on the grapevine that they've merged these. I would be very grateful if you could summarise your responses for me, as I'm looking for something similar, although my application is quite different - direct marketing campaigns! Regards, Paul. 4.Just in case you were not aware, we produce a product called Answer Tree You should find info - www.spss.com/answertree/ Click on the "order now" link and then select "UK" and this should give you some price information - without comitting yourself to buying anything. I have to say I do not know of any excel add-ons. It would be interesting to see a summary of responses. Hope this helps Ted Snowdon User Interface Designer SPSS (UK) Tel: +44 (0) 1483 - 719 318 Fax: +44 (0) 1483 - 719 290 5. In case no-one else mentions it, you may be interested to know that STATISTICA includes a very comprehensive and up-to-date classification (decision) trees module. See http://www.statsoft.com/exploratory.html#classification for more information. Unfortunately this comes as part of a larger system and cannot be purchased alone, but we do have some good academic price deals. Please let me know if you wish to discuss anything further. Matt Coates Technical Services Department StatSoft Ltd Phone: + 44 (0) 1234 341226 e-mail: [log in to unmask] 6. You can take a look at www.treeage.com or alternatively you can build your own tree in Excel. There are a number of add-in to Excel to run stochastic analyses. Two of these are Crystal Ball (http://www.decisioneering.com/), and and @risk (http://www.palisade.com/). These websites provide all the details about their acquisition cost, demo versions, etc. Good luck Andrea -- 7. dave parsons wrote Have a look at this web page http://www.sis.pitt.edu/~dsl/da-software.html 8. Try http://www.recursive-partitioning.com/ John F. Bell hope this is useful regards ann ------------ Ann E Fitzmaurice Dugald Baird Centre for Research on Women's Health Department of Obstetrics and Gynaecology (University of Aberdeen) Aberdeen Maternity Hospital Cornhill Road Aberdeen AB25 2ZL Scotland, UK. Tel. + 44 1224 553876 Fax: +44 1224 404925 [log in to unmask] ([log in to unmask])