> 1.- According to the manual the log.p parameter is always the last one. > 2.- When you use the software, the last parameter seems to be lower.tail
AFAIK, R has no concept of "last parameter" in a function call. It has the concept of "first parameter", "second paramter", etc., but not "last". >> pt (1.1, 5) > [1] 0.8392746 >> pt (1.1, 5, F) > [1] 0.8392746 >> pt (1.1, 5, F, T) > [1] 0.8392746 >>=0D > 4.- Acording to the mannual, the lower.tail should be the third argument an= > d not the last one. No. According to ?pt or args(pt), pt can take five parameters, the third of which (when they aren't named) is `ncp', not `lower.tail'. What happens in your calls is that your third argument F is converted to 0, which is the default for ncp (and then the T is given to `lower.tail', which is the default value for that parameter). It is often a very good practice to name the arguments explicitly in function calls. Your calls above would be equivalent to pt(q = 1.1, df = 5) pt(q = 1.1, df = 5, ncp = F) # or ncp = 0 pt(q = 1.1, df = 5, ncp = F, lower.tail = T) # or ncp = 0 You will find that pt(q = 1.1, df = 5, lower.tail = F) and pt(q = 1.1, df = 5, lower.tail = F, log.p = T) give quite different answers. -- Bjørn-Helge Mevik ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
