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st: RE: -Makematrix- and -signrank-


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: -Makematrix- and -signrank-
Date   Fri, 13 Feb 2009 19:26:53 -0000

Your call to -makematrix- is illegal syntax as far as it is concerned.
Hence the message "illegal syntax". 

Look at the syntax again: 

makematrix [matrix_name] ,
                 from(results_list) [production_options] [list_options]
:
                 ["]command["] [varlist] ... [, options ]

offer = offer1 

is _not_ a varlist. The operator = rules that out. 

You want to put two numbers into a matrix. I don't know why, but here is
how to do it after -signrank- 

matrix m = J(1,2,.)
matrix m[1,1] = r(z)
matrix m[1,2] = 2*normprob(-abs(r(z)))

-makematrix- is not designed for what you want, but it is not needed
either. 

Nick 
n.j.cox@durham.ac.uk 

Herve STOLOWY

In the past, I used -makematrix- (downloadable from ssc) in conjunction
with -ranksum- without any difficulty. I used the following command:  
makematrix m1, from(r(z) 2*normprob(-abs(r(z)))) : ranksum offer,
by(info).

Now, I want to use -makematrix- in conjunction with signrank. In a
different file, I have splitted my variable offer in two: offer0 and
offer1.

I do:  signrank offer0 = offer1 and I get the following output:

Wilcoxon signed-rank test

        sign |      obs   sum ranks    expected
-------------+---------------------------------
    positive |       12        9780     16707.5
    negative |       29       23635     16707.5
        zero |      794      315615      315615
-------------+---------------------------------
         all |      835      349030      349030

unadjusted variance    48602428
adjustment for ties       -1435
adjustment for zeros  -41792686
                     ----------
adjusted variance     6808306.3

Ho: offer0 = offer1
             z =  -2.655
    Prob > |z| =   0.0079

When I do:

makematrix m1, from(r(z) 2*normprob(-abs(r(z)))) : signrank offer0 =
offer1

I get an error message: invalid syntax.


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