Nick,
you are right. To avoid this, it´s important to sign with your advice
and insert in the message something like this:
TITLE
STB-58 sg84_3. Concordance correlation coefficient: minor corrections
DESCRIPTION/AUTHOR(S)
STB insert by Thomas J. Steichen, RJRT
Nicholas J. Cox, University of Durham, UK
Support: [email protected], [email protected]
After installation, see help concord
Joao Lima
2008/11/25 Nick Cox <[email protected]>:
> Joao doesn't mean what he says. _N-1 is the subscript of the next to
> last observation in a group. _n-1 is the subscript of the previous
> observation.
>
> I doubt that, even if corrected for this typo, this is what Joseph
> wants. It just checks whether the previous value was the same or
> different. Joseph wants to measure reliability, a different though
> tangentially related story.
>
> Nick
> [email protected]
>
> Joao Ricardo F. Lima
>
> I think that this can do the trick:
>
> by idcode: assert var1-var1[_N-1]==0
>
> 2008/11/25 Joseph Wagner <[email protected]>:
>
>> I wish to use the program -concord- to perform an interrater
> reliability for
>> a rater. The data is arranged as such:
>>
>> idcode date var1 var2
>> --------------------------------------------
>> person1 date var1 var2
>> person1 date var1 var2
>> person2 date var1 var2
>> person2 date var1 var2
>>
>>
>> there are too many variables and observations for me to -reshape- wide
> so I
>> thought that I could try this:
>>
>> bysort idcode date: concord var1 var1[_n-1] since the data is
> arrayed
>> as pairs of observations which I wish to compare
>>
>> but instead of working I get the following error: "_n unknown weight
> type"
>>
>> Am I forced to try some sort of piecewise -reshape- (sets of
> variables) or
>> am I just doing this all wrong?
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
--
----------------------------------------
Joao Ricardo Lima, D.Sc.
Professor
UFPB-CCA-DCFS
Fone: +553138923914
Skype: joao_ricardo_lima
----------------------------------------
*
* For searches and help try:
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* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
