Trouble with Wald testing after update to stata 16

[Suzanne van Landingham]

Hi, I just updated from stata 15 to 16. I tried to run a do-file that had worked well on stata 15 but I keep getting error messages when it gets to the "test" command. My program uses survey methodology. Here's a sample line, in which mvpa_min is a continuous variable and college is a binary variable (yes, no):
svy, subpop(if include==1): mean mvpa_min, over(college)
test [mvpa_min]yes = [mvpa_min]no
The error message I get is:
equation [mvpa_min] not found
which I did not get when I used Stata 15.
I read the help file for the test command but still don't understand why it isn't working for me anymore. Any thoughts?
Thanks!

[Scott Merryman]

Use the -coeflegend- option to see how Stata to specifying the coefficients:

. sysuse auto,clear
(1978 Automobile Data)

. mean price, over(fore) coefleg

Mean estimation                   Number of obs   =         74

---------------------------------------------------------------------------------
                |       Mean  Legend
----------------+----------------------------------------------------------------
c.price@foreign |
      Domestic  |   6072.423  _b[[email protected]]
       Foreign  |   6384.682  _b[[email protected]]
---------------------------------------------------------------------------------

. test _b[[email protected]]= _b[[email protected]]

 ( 1)  [email protected] - [email protected] = 0

       F(  1,    73) =    0.20
            Prob > F =    0.6591

[Richard Williams]

You can often avoid such problems by using

version 15

before the other commands you were using in 15.