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MathGroup Archive 2006

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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/



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