Dear All, I am analyzing the miRNA data set in which I have 817 unique probes for each they have 20 features each . I have to group the similar features and take the median across them so that I have a data with no repeats to perform invariant analysis . My data looks something similar format probename sample1 sample2 sample3 A 2.3 2.4 2.5 A 8.9 3.6 7.9 A 4.7 4.4 2.2 C 2.2 2.1 2.3 C 1.3 1.3 2.9 B 2.2 2.1 2.7 B 2.2 2.1 2.8 I have to group the probename elements and and get median across them. Please help with this so that I can get complete my analysis . -- Thanks Hari 215-385-4122 "If there is anyone out there who still doubts that America is a place where all things are possible" [[alternative HTML version deleted]]

On Wed, Feb 24, 2010 at 8:27 PM, Harikrishnadhar <hari.bombex at="" gmail.com=""> wrote: > Dear All, > > I am analyzing the miRNA data set in which I have 817 unique probes for each > they have 20 ?features each . I have to group the similar features and take > the median across them so that I have a data with no repeats to perform > invariant analysis . > > My data looks something ?similar format > > probename ?sample1 sample2 sample3 > A ? ? ? ? ? ? ? ? 2.3 ? ? ? ? ?2.4 ? ? ? ?2.5 > A ? ? ? ? ? ? ? ? 8.9 ? ? ? ? ?3.6 ? ? ? ?7.9 > A ? ? ? ? ? ? ? ? 4.7 ? ? ? ? ? 4.4 ? ? ? 2.2 > C ? ? ? ? ? ? ? ? 2.2 ? ? ? ? ? 2.1 ? ? ? 2.3 > C ? ? ? ? ? ? ? ? 1.3 ? ? ? ? ? 1.3 ? ? ? 2.9 > B ? ? ? ? ? ? ? ? 2.2 ? ? ? ? ? ?2.1 ? ? ?2.7 > B ? ? ? ? ? ? ? ? 2.2 ? ? ? ? ? ?2.1 ? ? ?2.8 > > I have to group the probename ?elements and and get median across them. > Please help with this so that I can get complete my analysis . Hi, Hari. To answer your question directly, have a look at the aggregate() function. That said, I'm not sure where you are headed with your analysis.... Sean