```Date: Thu, 7 Feb 2008 15:59:59 -0700 Reply-To: ViAnn Beadle Sender: "SPSSX(r) Discussion" From: ViAnn Beadle Subject: Re: formula for median in SPSS Comments: To: "Biggert, Robert (Sociology)" In-Reply-To: Content-Type: text/plain; charset="us-ascii" I'm curious as to what the "consensual" way to calculate a median is. IIRC, there are about 4 ways to do this. You'll find the algorithms at http://support.spss.com/ProductsExt/SPSS/Documentation/Statistics/algorithms /index.html -----Original Message----- From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of Biggert, Robert (Sociology) Sent: Thursday, February 07, 2008 1:11 PM To: SPSSX-L@LISTSERV.UGA.EDU Subject: formula for median in SPSS In teaching a stats class, I compared some medians, some calculated by hand and some in SPSS. Given the consensual definition of a median as the (n+1)/ 2 value in an ordered distribution, I was assuming the two sets of medians would be identical. However, some weren't. The data set I was using was small (n=15) and for some of the variables there were duplicate values at or near the median. I'm assuming SPSS used the formula with some correction factor but couldn't find the formula in SPSS or on the internet. So my question is: How does SPSS calculate the median? Thanks, RB ======= To manage your subscription to SPSSX-L, send a message to LISTSERV@LISTSERV.UGA.EDU (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD ===================== To manage your subscription to SPSSX-L, send a message to LISTSERV@LISTSERV.UGA.EDU (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD ```

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