RE: Draw approximated normal distribution based on mean, median, percentiles?
- To: mathgroup at smc.vnet.net
- Subject: [mg70111] RE: [mg70092] Draw approximated normal distribution based on mean, median, percentiles?
- From: "Richard Flaaten" <richard at flaaten.com>
- Date: Wed, 4 Oct 2006 05:58:55 -0400 (EDT)
- Reply-to: <richard at flaaten.com>
Well yeah, it probably is skewed, which is what I need to illustrate. Given the mean, median as well as 25 and 75 percentiles, I should be able to do this, right? I just have no idea how :) I'm still very much a beginner at Mathematica. A guy called Stern sent me an e-mail telling me to try to use a beta distribution to try to "fit" the data. That might sound like a good idea, I just don't know how to start doing it. Thanks for your input so far! Maybe if someone knows of a beginners forum that might be a better place to start rather than bugging all of the mathgroup? rich -----Original Message----- From: chris.chiasson at gmail.com [mailto:chris.chiasson at gmail.com] On Behalf To: mathgroup at smc.vnet.net Subject: [mg70111] Re: [mg70092] Draw approximated normal distribution based on mean, median, percentiles? If it's truly a normal distribution, they have given you too much information. The mean and median would be exactly the same. The the location of any quantile would be enough to get you the location of any other quantile. On 10/3/06, rflaaten at start.no <rflaaten at start.no> wrote: > Hello all, > > I searched the forum for any info on this, so here goes. > > I need to reference some statistical data from a study. The information > given there for an age distribution is: mean, standard deviation, > median plus the 25th and 75th percentiles. Now, I have tried in vain to > get Excel or SPSS to draw this for me. Is there any way of inputting > percentiles and median into Mathematica? The normal distribution > function only takes mean and sd as far as I know. > > > Any help would be much appreciated. > Richard > > -- http://chris.chiasson.name/