invalid name error - r(198)

[Sean Bilic]

I want to test whether kappa is equal to 1 or not.

But I see this error. How can I fix it?

[William Lisowski]

In Stata 17,

test /kappa = 1

worked with the example data I used and the example regression I ran.

However, in versions 14 and earlier the syntax required is apparently

test [kappa] = 1

Please take a few moments to review the Statalist FAQ linked to from the top of the page, as well as from the Advice on Posting link on the page you used to create your post. Note especially sections 9-12 on how to best pose your question.

In this case, the FAQ advises you to show the command you ran, and if you are not running the latest version of Stata, tell us the version you are running.

[Sean Bilic]

In Stata 17,

test /kappa = 1

worked with the example data I used and the example regression I ran.

However, in versions 14 and earlier the syntax required is apparently

test [kappa] = 1

Please take a few moments to review the Statalist FAQ linked to from the top of the page, as well as from the Advice on Posting link on the page you used to create your post. Note especially sections 9-12 on how to best pose your question.

In this case, the FAQ advises you to show the command you ran, and if you are not running the latest version of Stata, tell us the version you are running.

--------

Yes I use Stata 14.

But this code did not work as well.

Code:

. test [kappa] = 1
kappa not found
r(111);

[Sean Bilic]

In Stata 17,

test /kappa = 1

worked with the example data I used and the example regression I ran.

However, in versions 14 and earlier the syntax required is apparently

test [kappa] = 1

Please take a few moments to review the Statalist FAQ linked to from the top of the page, as well as from the Advice on Posting link on the page you used to create your post. Note especially sections 9-12 on how to best pose your question.

In this case, the FAQ advises you to show the command you ran, and if you are not running the latest version of Stata, tell us the version you are running.

--------

Yes I use Stata 14.

But this code did not work as well.

Code:

. test [kappa] = 1
kappa not found
r(111);

[Carlo Lazzaro]

Sean:
after some trial-and-error sessions

mat list e(b)

put me on the right track with Stata 14:

. use https://www.stata-press.com/data/r14/cancer
. stset studytime, failure(died)

     failure event:  died != 0 & died < .
obs. time interval:  (0, studytime]
 exit on or before:  failure

------------------------------------------------------------------------------
         48  total observations
          0  exclusions
------------------------------------------------------------------------------
         48  observations remaining, representing
         31  failures in single-record/single-failure data
        744  total analysis time at risk and under observation
                                                at risk from t =         0
                                     earliest observed entry t =         0
                                          last observed exit t =        39

. replace drug = drug==2 | drug==3
(28 real changes made)

. streg drug age, distribution(ggamma) nolog

         failure _d:  died
   analysis time _t:  studytime
note: drug omitted because of collinearity

Generalized gamma regression -- accelerated failure-time form

No. of subjects =           48                  Number of obs    =          48
No. of failures =           31
Time at risk    =          744
                                                LR chi2(1)       =        6.63
Log likelihood  =   -57.175276                  Prob > chi2      =      0.0100

------------------------------------------------------------------------------
          _t |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
        drug |          0  (omitted)
         age |  -.0771936     .03141    -2.46   0.014     -.138756   -.0156312
       _cons |   7.173099   1.687563     4.25   0.000     3.865537    10.48066
-------------+----------------------------------------------------------------
     /ln_sig |   -.009931   .2119507    -0.05   0.963    -.4253468    .4054847
      /kappa |   .2632982   .6947163     0.38   0.705    -1.098321    1.624917
-------------+----------------------------------------------------------------
       sigma |   .9901181   .2098562                      .6535431    1.500029
------------------------------------------------------------------------------


. mat list e(b)

e(b)[1,5]
            _t:         _t:         _t:     ln_sig:      kappa:
          drug         age       _cons       _cons       _cons
y1   1.3946577  -.07804164   6.4560907  -.37936318   .46692516



.  test [kappa]_cons=1

 ( 1)  [kappa]_cons = 1

           chi2(  1) =    1.12
         Prob > chi2 =    0.2889

.

I had to realize once more that Stata always rules. Therefore, I shall keep on learning how it works behind the curtain.
Tables with smart rows and columns are frills; whereas Stata calculates using matrices.