On Thu, 2011-01-27 at 09:50 -0500, Thomas Stewart wrote: > For question 2, > > TTT <- rt(1000,3) > mean(TTT[rank(TTT) <= 975 & rank(TTT) >25])
mean(TTT, trim = 0.05) What you are doing is only removing 5% of observations in total, whilst the question asks for 5% removed off *each* end. G > > On Thu, Jan 27, 2011 at 8:16 AM, Ben Boyadjian <benjy_cy...@hotmail.com>wrote: > > > Hello I am trying to solve these problems and I am not allowed to use loops > > or ifs. > > > > 1st Question > > My first question is that I have generated 100 random numbers from the > > uniform distribution then > > A)add only the negative integers. > > B)add elements until the first appearance of a negative element. > > > > I know how to choose the negative elements for A but how to find integers? > > And I dont know what to do for B. > > > > 2nd Question > > Simulate 1000 observations from the student-t distribution with 3 degrees > > of freedom and then calculate the truncated mean by excluding bottom 5% and > > top 5%. > > > > Thank yoou > > > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.