Beta coefficient Zero

[Alejandro Torres]

Dear statalisters,

I would like to ask you please why a coefficient and its paramenters could be zero?
In the next output, you can see coefficient with value zero for mkt and for the constant. I think is not collinearity because usally when that happens it says omitted.

Thank you very much for any guide about it.
best regards, Alejandro

The command used was (in stata 15)

metareg  es p i m pn en eqa neq cha dex mult nfpa ac stk mkt surv tec man cper adj log fsi fag fsal rdi sla ppv pdep aim aag apex prel rda psi npa asi acop cul geo gdp tru usa cty nv ivi ind yea [w=fo], model (mm)

Meta-Analytic Random Intercept, Fixed Slopes Regression Analysis

Source             Q        df          P             No. of obs  =    985
Mean ES = 0.0169
Model      363.4017        46    0.00000               R-squared = 0.1973
Residual     1478.8882       938    0.00000

Total     1842.2899       984    0.00000


Variable       Coef.   Std. Err.          z      P>z  [95% Conf. Interval]

p           -.065044     .022584   -2.88006   0.003976   -.109309   -.020779
i           -.009889     .003381   -2.92526   0.003442   -.016515   -.003263
m            .001551     .000946    1.63816   0.101388   -.000305    .003406
pn           .004085     .016347    .249909   0.802658   -.027955    .036126
en           .000029     .012981    .002208   0.998238   -.025414    .025472
eqa          -3.0753     1.89876   -1.61965   0.105307   -6.79692    .646237
neq          -3.0625     1.89999   -1.61184   0.106998   -6.78644    .661506
cha          -3.0349     1.89801   -1.59897   0.109828   -6.75495    .685239
dex          -3.0353     1.89699   -1.60004   0.109590   -6.75335    .682838
mult         -3.0545     1.89847   -1.60892   0.107633   -6.77549    .666508
nfpa         -2.9649     1.89882   -1.56144   0.118420   -6.68657    .756796
ac           .021129     .036228    .583216   0.559748   -.049878    .092136
stk          .099349     .035932    2.76493   0.005693    .028923    .169776
mkt                0           0          .          .          0          0
surv        -.005492     .035802   -.153387   0.878093   -.075664    .064681
tec          .051017     .037522    1.35965   0.173941   -.022526     .12456
man           .12225     .033437    3.65606   0.000256    .056711    .187783
cper         -.36405     .110126   -3.30574   0.000947   -.579893     -.1482
adj           .15403     .056897    2.70716   0.006786    .042511    .265548
log          .068147      .02593    2.62811   0.008586    .017324     .11897
fsi          .015069     .012428    1.21246   0.225336   -.009291    .039428
fag          .040444     .015558    2.59951   0.009336     .00995    .070938
fsal        -.058324     .025717   -2.26787   0.023337    -.10873   -.007918
rdi          .091974     .017304    5.31532   0.000000    .058059    .125889
sla         -.030345      .02516   -1.20608   0.227787   -.079659    .018969
ppv         -.000034      .02493   -.001354   0.998920   -.048896    .048829
pdep         -.03831     .021825   -1.75535   0.079199   -.081087    .004466
aim         -.057982     .022561   -2.57001   0.010170   -.102201   -.013762
aag          .006862     .014614    .469535   0.638688   -.021781    .035504
apex        -.015677     .013575   -1.15483   0.248159   -.042284     .01093
prel         .065808     .013478    4.88259   0.000001    .039391    .092226
rda         -.057806     .019643   -2.94284   0.003252   -.096306   -.019306
psi         -.068684     .025796   -2.66261   0.007754   -.119245   -.018124
npa          .033065     .018311    1.80574   0.070958   -.002825    .068954
asi         -.069288     .017784   -3.89614   0.000098   -.104144   -.034432
acop         .055751     .018406    3.02897   0.002454    .019675    .091826
cul          .062433     .015462    4.03795   0.000054    .032128    .092738
geo         -.011336     .022671   -.500025   0.617057   -.055772    .033099
gdp          .021191     .020028     1.0581   0.290011   -.018063    .060445
tru         -.021388     .020313   -1.05291   0.292382   -.061202    .018426
usa          .022632     .023017    .983251   0.325484   -.022482    .067745
cty         -.008364     .027037   -.309353   0.757053   -.061357    .044629
nv           .000372     .000423    .880756   0.378450   -.000456    .001201
ivi         -.006033     .014989   -.402481   0.687330    -.03541    .023345
ind         -.074778     .012284   -6.08766   0.000000   -.098854   -.050702
yea         -.041271     .013598   -3.03498   0.002406   -.067923   -.014618
_cons              0           0          .          .          0          0

Random effects variance component (via method of moments) =  .0118395

[Nick Cox]

Already posted at https://www.statalist.org/forums/for...d-wilson-macro

Please don't repeat posts. This is explained in the FAQ Advice.

I've never used this command and am not able to answer myself.

Anyone who can: please follow the other thread, which has a better title.

[Alejandro Torres]

Hello Nick,
Thank you for the advice. I did it because here I just wanted to be concentrated in one question, that could be a general question related with the zero at the coefficient, but not related with the metareg, the other post was directly related to the metareg, with more questions related to the metareg and here only about the zeros. I apologize.
Alejandro

[Nick Cox]

If there is a case for repeating a question under a different title, then the minimal expectation is surely that you cross-refer in each thread to the other. A better solution is a thread title which covers the important bases.

[Alejandro Torres]

Thank you Nick, its not going to happen again.
Best,
Alejandro

[Nick Cox]

Thanks for #5.