Admin
1
Does someone know an easy way to get Stata to display more than just three digits for the p-value when running a Tobit regression?
Normally Stata reports that the p-value is .001 or .065, but I would like to see more digits, for example, .0011123 or .065320.
To be clear, I don't want to (necessarily) alter the way the data is produced in the regression table.
I only want to be able to get Stata to display more digits for those p-values I am interested in.
Using the first example from the tobit command help file:
. sysuse auto, clear
. generate wgt = weight / 1000
. tobit mpg wgt, ll(17)
Tobit regression Number of obs = 74
LR chi2(1) = 72.85
Prob > chi2 = 0.0000
Log likelihood = -164.25438 Pseudo R2 = 0.1815
------------------------------------------------------------------------------
mpg | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
wgt | -6.87305 .7002559 -9.82 0.000 -8.268658 -5.477442
_cons | 41.49856 2.05838 20.16 0.000 37.39621 45.6009
-------------+----------------------------------------------------------------
/sigma | 3.845701 .3663309 3.115605 4.575797
------------------------------------------------------------------------------
18 left-censored observations at mpg <= 17
56 uncensored observations
0 right-censored observations
You can easily obtain any p-value from the returned results in r():
. matrix list r(table)
r(table)[9,3]
model: model: sigma:
wgt _cons _cons
b -6.8730504 41.498557 3.8457011
se .70025591 2.0583803 .36633085
t -9.8150552 20.160782 .b
pvalue 5.610e-15 1.471e-31 .b
ll -8.2686584 37.396211 3.1156048
ul -5.4774424 45.600903 4.5757975
df 73 73 73
crit 1.9929971 1.9929971 1.9929971
eform 0 0 0
And then format it accordingly:
. matrix results = r(table)
. display %18.17f results[4,1]
0.00000000000000561
Type help format from Stata's command prompt for more information.