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st: RE: test after -nl- (figured it out)


From   "FEIVESON, ALAN H. (AL) (JSC-SK) (NASA)" <alan.h.feiveson@nasa.gov>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: test after -nl- (figured it out)
Date   Wed, 2 Jun 2004 14:05:24 -0500

OOPS - now that I posted this, I figured out that one needs to write
something like

 test _b[b0]=_b[b3]

Al Feiveson

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of FEIVESON, ALAN
H. (AL) (JSC-SK) (NASA)
Sent: Wednesday, June 02, 2004 1:58 PM
To: statalist (E-mail)
Subject: st: test after -nl-


Hi - After all these years of using -nl-, I apparently never tried to use
-test- after estimation. But it doesn't work, even though the (Stata 8,
p.48) manual mentions -test- as a complementary reference at the end of the
-nl-section. So what am I doing wrong (see below)?

. nl vbgfno ml age sex
(obs = 24)

Iteration 0:  residual SS =   4427965
.......etc.
Iteration 9:  residual SS =   48.2238

      Source |       SS       df       MS            Number of obs =
24
-------------+------------------------------         F(  6,    18) =
3553.46
       Model |  57120.5084     6  9520.08474         Prob > F      =
0.0000
    Residual |  48.2237977    18  2.67909987         R-squared     =
0.9992
-------------+------------------------------         Adj R-squared =
0.9989
       Total |  57168.7322    24  2382.03051         Root MSE      =
1.636796
                                                     Res. dev.     =
84.85622
VBGF, ml=b0*(1-exp(-b1*(age-b2))) if sex=1; b3*(1-exp(-b4*(age-b5))) if
sex=2
----------------------------------------------------------------------------
--
          ml |      Coef.   Std. Err.      t    P>|t|     [95% Conf.
Interval]
-------------+--------------------------------------------------------------
--
          b0 |   55.97801   1.138011    49.19   0.000     53.58714
58.36888
          b1 |   .3855844   .0409733     9.41   0.000     .2995027
.4716662
          b2 |   .1713388   .1489188     1.15   0.265    -.1415279
.4842055
          b3 |    61.2333   1.170976    52.29   0.000     58.77317
63.69343
          b4 |   .2962532   .0277204    10.69   0.000     .2380147
.3544917
          b5 |  -.0572645   .1691157    -0.34   0.739    -.4125634
.2980343
----------------------------------------------------------------------------
--
 (SEs, P values, CIs, and correlations are asymptotic approximations)


. test b0=b3
b0 not found
r(111);

. test [ml]b0=50
equation [ml] not found
r(303);

Thanks

Al Feiveson
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