Hi All, a colleague asked me if R has a function producing a Partial Rank Correlation Coefficient, sensu Blower and Dowlatabadi 1994 [1]. I personally would not have a clue, and I could not find something like that on the search page... although I would not be surprised if it's there under a different name. Incidentally, unfortunately the function, assuming it exists, is to be fed to some MSc students. They are supposed to learn how to use R, but are not supposed to know/understand what maths and stats are under the bonnet of the test (I don't run the course, no comment). So the 'plan' is to give them a lecture about models in epidemiology and sensitivity, and then the punch line should be: 'and the PRCC can be asily done in R using the function ???'. Cheers, Federico [1] S.M. Blower and H. Dowlatabadi, 1994. SENSITIVITY AND UNCERTAINTY ANALYSIS OF COMPLEX-MODELS OF DISEASE TRANSMISSION - AN HIV MODEL, AS AN EXAMPLE. International Statistical Review 62(2) 229-243. -- Federico C. F. Calboli Department of Epidemiology and Public Health Imperial College, St Mary's Campus Norfolk Place, London W2 1PG Tel +44 (0)20 7594 1602 Fax (+44) 020 7594 3193 f.calboli [.a.t] imperial.ac.uk f.calboli [.a.t] gmail.com