- To: mathgroup at smc.vnet.net
- Subject: [mg18232] Re: [mg18214] quartiles
- From: "Wolf, Hartmut" <hwolf at debis.com>
- Date: Thu, 24 Jun 1999 14:24:16 -0400
- Organization: debis Systemhaus
- References: <199906230041.UAA04362@smc.vnet.net.>
- Sender: owner-wri-mathgroup at wolfram.com
Tom De Vries schrieb:
> Hello !
> I am working with some statistics problems and have a question about finding
> quartiles for a set of data
> Load in the package
> create a set of data
> salaries =
> ask for the quartiles
> and this is the response
> At this point I am probably revealing my ignorance of statistics....
> 250000,100000,60000,60000,40000,40000, 40000
> 40000, Median
> The lower quartile is the median of the values below the median, which I get
> with Mathematica
> The upper quartile should be the median of the numbers above the median, so
> why is it 55000?
> 40000,40000, 40000
> Does Mathematica use some algorithm to get rid of outliers before finding
> quartiles, or does it eliminate the median from the data set before finding
> the quartiles, .....?
> The set of data I used as an example was taken from the math text I am using
> and the answer the text supplies, and the answer I think I should get, is
> different from the one Mathematica gets. I would appreciate any advice on this!
In:= salaries =
How is this to be interpreted? Look at
"Quartiles[list] gives a list of the interpolated .25, .50, and .75
quantiles of the entries in list."
Regard "interpolated". However if you do
which might be what you expect.
But I think your definitions of lower and upper quartile are imprecise
(what does "values below/above the median" mean exactly?) and sometimes
kind regards, hw
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- From: "Tom De Vries" <email@example.com>