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Re: Recode
From: |
pohaku |
Subject: |
Re: Recode |
Date: |
Wed, 9 Jan 2013 10:37:55 -0800 (PST) |
Ben Pfaff wrote:
>
> On Wed, Jan 09, 2013 at 09:22:12AM -0800, pohaku wrote:
>>
>> In recode you use (num1 thru num2 = ?). But, suppose you are recoding
>> continuous data, then it is likely that num2 of one code is num1 of next.
>> Example recoding student GPA
>>
>> (2.222 thru 2.555 = C)
>> (2.555 thru 3.000 = B)
>>
>> the question is -- is the logic of the recode
>>
>> (2.222<= X <2.555 =C)
>> (2.555<=X <3.000 = B)
>
> It's 2.222 <= x <= 2.555 becomes C, 2.555 < x <= 3.000 becomes B.
>
> to be clear... the firs recode is inclusive on upper and lower end of
> range and successive recodes are exclusive and inclusive
> (2.222<= X <=2.555 =C)
> (2.555 < X =< 3.000 = B)
> (3.000 < X =< 4.000 = A)
> (4.000 < X =< 4.200 = A+)
> (4.200 < X <= highest =A++)
>
> is this the logic above? for real/continuous data the boundaries are
> important. all the documentation is more or less categorical or discrete
> in nature thus this boundary issue doesn't come up. just that i am using
> PSPP for first time in intro stats course and chapter 2 is qualitative
> descriptive stats and recoding of continuous to categorical is rather
> essential to create a meaningful frequency distribution table with a
> reasonable number of rows.
>
>
>
>
>> there is no clarify in the documentation about the end points being
>> strictly
>> less than or less than-equal.
>
> The use of square brackets in the documentation is supposed to indicate
> that the end points are included, but I see now that this is not as
> clear as it could be.
>
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