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Re: st: RE: query on testing uniform distributions
From
Maarten Buis <[email protected]>
To
[email protected]
Subject
Re: st: RE: query on testing uniform distributions
Date
Wed, 2 Nov 2011 08:35:20 +0100
On Tue, Nov 1, 2011 at 6:00 PM, Sergio Salis <[email protected]> wrote:
> I understand that to check whether employment_start_dates follow a uniform distribution I can also use the ksmirnov test. It is not clear to me what the command -ksmirnov hazel=hazel- actually does (so I would appreciate if you could provide some further explanation on this).
To quote the helpfile of -ksmirnov-: "varname is the variable whose
distribution is being tested, and exp must evaluate to the
corresponding (theoretical) cumulative."
>However, if employment_start_dates was a continuous variable I would use
>
> -ksmirnov employment_start_date=14341+int((14705-14341+1)*runiform())
That sounds completely wrong to me: In this case your cumulative
density function contains a call to a random number generator.
> where 14705 is the first and 14341 the last day of the tax year of interest. Is this syntax line correct in case one deals with a continuous variable? If so, how can it be changed to deal with a discrete variable, which is my case?
You do so by deriving the cumulative density function for a discrete
uniform distribution and put that after the equal sign.
Hope this helps,
Maarten
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
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