Utest command by Lind and Mehlum (2010) - variables are not found

[Fadi Ansar]

Dear All,

I wanted to test U test for the relationship between NPL and loan growth .After running the commnad ,I am getting following error.What could be the reason ,can any one help me to rectify this.I even tried the solutions given the earlier post ,still it is not working for me
Attaching the code below

 regress gnpa_percent loan_growth loangrowth_sq

      Source |       SS           df       MS      Number of obs   =       765
-------------+----------------------------------   F(2, 762)       =    244.20
       Model |  10259.5564         2  5129.77822   Prob > F        =    0.0000
    Residual |  16007.1944       762  21.0068168   R-squared       =    0.3906
-------------+----------------------------------   Adj R-squared   =    0.3890
       Total |  26266.7508       764  34.3805639   Root MSE        =    4.5833

-------------------------------------------------------------------------------
 gnpa_percent | Coefficient  Std. err.      t    P>|t|     [95% conf. interval]
--------------+----------------------------------------------------------------
  loan_growth |  -.2412188   .0109234   -22.08   0.000    -.2626623   -.2197753
loangrowth_sq |    .000653   .0001627     4.01   0.000     .0003336    .0009725
        _cons |   8.718474   .2337469    37.30   0.000      8.25961    9.177338
-------------------------------------------------------------------------------

. nlcom -_b[loan_growth] / (2*_b[loangrowth_sq])

       _nl_1: -_b[loan_growth] / (2*_b[loangrowth_sq])

------------------------------------------------------------------------------
gnpa_percent | Coefficient  Std. err.      z    P>|z|     [95% conf. interval]
-------------+----------------------------------------------------------------
       _nl_1 |   184.6882   45.58826     4.05   0.000     95.33688    274.0396
------------------------------------------------------------------------------

. local loan_growth_min = -146.596

. local loan_growth_max = 109.123

. utest gnpa_percent loan_growth , min(`loan_growth_min') max(`loan_growth_max')
gnpa_percent not found
r(111);

Any help is highly appreciated

Thanks and regards

[Rich Goldstein]

when using -utest-, you should NOT include the outcome variable from your regression and the command will reject it - as it did; the first variable name after the command name should be the predictor of interest; please see

h utest