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From Greg Sterijevski <gsterijev...@gmail.com>
Subject Re: [math] psychometrics
Date Sat, 03 Sep 2011 20:45:48 GMT
I've got you covered here. Phil, if you don't mind, I will float a few ideas
for multivariate interfaces. Then I will push a few examples of MVN?

-Greg

On Sat, Sep 3, 2011 at 3:32 PM, Patrick Meyer <meyerjp3@gmail.com> wrote:

> Ha ha... I was really hoping someone else would do all the hard work and
> write the MVN distribution function for me.
>
>
> On 9/3/2011 1:53 PM, Phil Steitz wrote:
>
>> On 9/3/11 10:37 AM, Patrick Meyer wrote:
>>
>>> No, I have written very few tests. Until I recently discovered
>>> jUnit, I was using a very crude way of testing my code. I plan to
>>> add more tests over the coming year.
>>>
>>> If you are registered with java.net, you can view the source code
>>> at http://java.net/projects/**psychometrics<http://java.net/projects/psychometrics>.
>>> I have requested that
>>> the project be made public but I don't know how long that will take.
>>>
>>> There is one dependency in the polychoric correlation package
>>> (com.itemanalysis.polycor) that could be problematic. The maximum
>>> likelihood estimator requires a multivariate normal (or at least
>>> bivariate normal) CDF. I use the one from
>>> http://vadim.kutsyy.com/java/**javadoc/com/kutsyy/util/**
>>> package-summary.html<http://vadim.kutsyy.com/java/javadoc/com/kutsyy/util/package-summary.html>
>>> Are there plans to add a multivaraite normal CDF function to
>>> commons math?
>>>
>> Patches welcome :)
>>
>> Phil
>>
>>> Patrick
>>>
>>>
>>>
>>> On 9/3/2011 12:36 PM, Greg Sterijevski wrote:
>>>
>>>> Do you have unit tests written for the different components?
>>>>
>>>> On Sat, Sep 3, 2011 at 10:48 AM, Patrick
>>>> Meyer<meyerjp3@gmail.com>   wrote:
>>>>
>>>>  Sounds good. Separating the general purpose stats from the
>>>>> psychometric
>>>>> specific stats seems like a natural way to distinguish the two
>>>>> libraries.
>>>>> I'll send a link to the source code soon. Hopefully, you will
>>>>> see the good
>>>>> ideas in the code.
>>>>>
>>>>>
>>>>> On 9/3/2011 12:57 AM, Phil Steitz wrote:
>>>>>
>>>>>  On 9/2/11 7:19 AM, Patrick Meyer wrote:
>>>>>>
>>>>>>  Yes, the math code is separate from the GUI and database for the
>>>>>>> most part. I'd be happy to share the code and documentation,
>>>>>>> but I
>>>>>>> need a few days to add it to a repository and get it online.
>>>>>>>
>>>>>>> There are parts of my library that can be transferred to math
>>>>>>> with
>>>>>>> very few changes but other parts that need more work to make
it
>>>>>>> more object oriented in style and less procedural. In any case,
>>>>>>> I'll send information about the code once I have it online.
>>>>>>>
>>>>>>>  Don't worry too much about making things beautiful.  Bad code
+
>>>>>> good
>>>>>> ideas is the combination that works [1].  The thing to think about
>>>>>> is what portions of your code are really general purpose math.
>>>>>> Most
>>>>>> likely kernel regression, polycor, histograms, etc., maybe not so
>>>>>> much test scaling for example.   Luc may have some good advice
>>>>>> having done this already with an space dynamics library (or maybe
>>>>>> Luc is so smart that there was no refactoring necessary :)
>>>>>>
>>>>>> What tends to work best is to bring things in incrementally,
>>>>>> talking
>>>>>> about the fit and how to integrate.
>>>>>>
>>>>>> Phil
>>>>>>
>>>>>> [1] http://s.apache.org/hZ
>>>>>>
>>>>>>  Patrick
>>>>>>>
>>>>>>> On 9/2/2011 9:26 AM, Gilles Sadowski wrote:
>>>>>>>
>>>>>>>  Hello.
>>>>>>>>
>>>>>>>>   I have been developing an pure Java application that does
a
>>>>>>>> variety
>>>>>>>>
>>>>>>>>> of psychometric methods. I use the commons math library
as much
>>>>>>>>> as I
>>>>>>>>> can but I've also had to develop my own library. I'd
like to
>>>>>>>>> combine
>>>>>>>>> the two libraries by donating as much of my code to commons
>>>>>>>>> math as
>>>>>>>>> I can. My library includes features for measurement
>>>>>>>>> reliability,
>>>>>>>>> test scaling, test equating, polychoric correlations,
histogram
>>>>>>>>> computations, kernel regression, etc. Most of these feature
are
>>>>>>>>> specialized to psychometrics, but is there any interest
in
>>>>>>>>> adding
>>>>>>>>> them to commons math? Are these methods too specialized
for
>>>>>>>>> commons
>>>>>>>>> math?
>>>>>>>>>
>>>>>>>>>  Can we have a look at the code and documentation?
>>>>>>>>
>>>>>>>>   If you're interested in seeing the application in action,
>>>>>>>> you can
>>>>>>>>
>>>>>>>>> download the full program from www.ItemAnalysis.com.
You'll
>>>>>>>>> notice
>>>>>>>>> that it also uses an Apache derby database for data management.
>>>>>>>>>
>>>>>>>>>  Is the math code separate from GUI and data management?
>>>>>>>>
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>> Gilles
>>>>>>>>
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