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Re: st: which statistical analysis to use


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: which statistical analysis to use
Date   Thu, 19 Apr 2012 12:03:54 +0100

A more general point is that you are not wedded to the scores as given
as long as there is a logic to how you treat or re-present them. For
example, if any skills are graded by 0 by everybody then I am not sure
you can do much with those except list them. As far as the other
skills are concerned, you could look at median and quartiles for
scores as well as mean scores.

Some years ago in an internal discussion about workload weights for
different kinds of administrative responsibilities we first rejected
the idea of keeping diaries and quantifying time spent because that
would be a pain and reward the inefficient and penalise the efficient.
Then someone who had been reading about Fibonacci numbers said
something like this. Consider the first few Fibonacci numbers 1, 2, 3,
5, 8, 13, 21. Let's have a system in which being Chair of Dept gets
21, being in charge of a major area gets 13, and so on down to being
just a committee member gets 1. This was just plucked out of the air
as a piece of pure mathematics, but what was interesting was the quick
consensus was that would produce as good a quantification as any other
scheme,

On Thu, Apr 19, 2012 at 11:30 AM, Deborah Beckers
<deborahbeckers@hotmail.com> wrote:
> Ok, thank you Nick, I will give that a try!
>
> Deborah
>
> ----------------------------------------
>> Date: Thu, 19 Apr 2012 11:25:10 +0100
>> Subject: Re: st: which statistical analysis to use
>> From: njcoxstata@gmail.com
>> To: statalist@hsphsun2.harvard.edu
>>
>> I don't understand this point about it being too bad that 1 is most
>> important. You can just reverse the scale so that 7 is most important.
>>
>> gen scale2 = cond(scale >=1, 8 - scale, 0)
>>
>> That gives you 7 -> 1, 6 -> 2, ..., 1 -> 7, 0 -> 0.
>>
>> Other ways of doing this include -recode-.
>>
>> Whether one-way anova is a good fit is another question. I suspect
>> that few off-the-shelf techniques are quite right here.
>>
>> Nick
>>
>> On Thu, Apr 19, 2012 at 11:14 AM, Deborah Beckers
>> <deborahbeckers@hotmail.com> wrote:
>> > Dear David,
>> >
>> > Thank you for your help!
>> > I am definitely going to look up that paper and books, I'm certain it will be useful, thankyou!
>> > Just like you said I was also thinking about replacing all the chosen skills by '1', this will certainly make things easier I think..
>> > Too bad that '1' is the most important, otherwise I could maybe have use a oneway anova like in this example:
>> > http://nd.edu/~rwilliam/stats1/Oneway-Stata.pdf
>> >
>> > Anyway, I'm going to have a look at those references you gave me, and if that doesn't work out I'll probably make the data dichotomous.. Again, thank you very much for your help!
>> > Deborah
>> >
>> >
>> >> Date: Wed, 18 Apr 2012 15:33:22 -0400
>> >> Subject: Re: st: which statistical analysis to use
>> >> From: dchoaglin@gmail.com
>> >> To: statalist@hsphsun2.harvard.edu
>> >>
>> >> Deborah,
>> >>
>> >> By an interesting coincidence, the issue of Computational Statistics &
>> >> Data Analysis that arrived today contains a paper on ranking data:
>> >>
>> >> Lee PH, Yu PLH. Mixtures of weighted distance-based models for ranking
>> >> data with applications in political studies.  Computational Statistics
>> >> & Data Analysis 2012; 56:2486-2500.
>> >>
>> >> That paper is probably not directly relevant to the analysis that you
>> >> are trying to do, but its list of references may be helpful in making
>> >> contact with that literature.  In particular, I noticed two books:
>> >>
>> >> Marden JI. Analyzing and Modeling Rank Data. Chapman and Hall, 1995.
>> >>
>> >> Fligner MA, Verducci JS (eds.). Probability Models and Statistical
>> >> Analyses for Ranking Data. Springer-Verlag, 1993.
>> >>
>> >> I hope this information is useful.
>> >>
>> >> David Hoaglin
>> >>
>> >> On Tue, Apr 17, 2012 at 7:59 AM, Deborah Beckers
>> >> <deborahbeckers@hotmail.com> wrote:
>> >> > Hello everybody,
>> >> >
>> >> >
>> >> > I'm having a problem with statistical analysis for my thesis. I am using stata 11 for windows.
>> >> > My data consists of a survey filled in by 360 companies, and the question I want to use is a question where they get a list of 27 employee skills, and they have to choose the 7 most important skills, by giving them a score from 1 to 7. The other skills (which they find less important) are not given any score (they are zero in my data). The data for that question thus looks somewhat as follows (example for 3 companies, one row per company:
>> >> >
>> >> >
>> >> > My question is: what kind of statistical analysis should I do, and how, to find out whether certain skills are ranked as more (or less) important than others by the companies, and if this difference is significant?
>> >>
>>
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