The name is absent



14


Stata Technical Bulletin


STB-33


commands (e.g., logistic, fit, glm) make this sample information available. Thus, if you use the mean option of diest
after sample selection, you should restate the if and/or in clauses and the weighting information. The two other display modes,
sezp and ci, ignore this information.

Examples

We illustrate the command diest via some output from a regression analysis of the repair record of cars using Stata’s
standard dataset auto.dta. First, we consider the regular Stata output.

. regress rep78 price length mpg foreign

Source I

SS

df

MS

Number of obs

F( 4,     64)

=      69

=   10.92

_________-|-_

—

Model I

27.0380695

4 6.75951737

Prob > F

= 0.0000

Residual ∣

39.5996117

64 .618743933

R-Squared

= 0.4057

Adj R-Squared

= 0.3686

_________-|-_

—

Total I

66.6376812

68 .979965899

Root MSE

=   .7866

—

rep78 I

Coef.

Std. Err.

t

p>∣t∣

[957. Conf.

—

Interval]

---------+_
price I

.0000242

.0000397

0.611

0.544

-.000055

.0001035

length I

.0125744

.008331

1.509

0.136

-.0040687

.0292174

≡pg I

.0674953

.027824

2.426

0.018

.0119106

.1230801

foreign I

1.25691

.2782758

4.517

0.000

.7009899

1.81283

_cons I

-.9302744

2.011363

-0.463

0.645

-4.948433

3.087884

The default output of diest replaces variable labels for the confidence intervals.

. diest

rep78 Repair Record 1978

I

Coef.

Std. Err.

t

p>∣t∣

—

price Price

I

.0000242

.0000397

0.611

—

0.544

length Length (in.)

I

.0125744

.008331

1.509

0.136

mpg Mileage (mpg)

I

.0674953

.027824

2.426

0.018

foreign Car type

I

1.25691

.2782758

4.517

0.000

_cons

I

-.9302744

2.011363

-0.463

0.645

On a color monitor, the numbers are in yellow, variable labels are in white, and the rest is in green. Some formatting produces
more readable output. Note that diest can be called after an estimation command as often as desired. It is also still possible
to recall the regress output by issuing the regress command without arguments.

. diest, fb(%9.3f) fse(%9.3f)

rep78 Repair Record 1978

I

Coef.

Std. Err.

t

p>∣t∣

—

price Price

I

0.000

0.000

0.611

—

0.544

length Length (in.)

I

0.013

0.008

1.509

0.136

mpg Mileage (mpg)

I

0.067

0.028

2.426

0.018

foreign Car type

I

1.257

0.278

4.517

0.000

_cons

I

-0.930

2.011

-0.463

0.645

Confidence intervals can be obtained via the ci display mode.

. diest, ci fb(%9.3f) fci(%9.3f)

rep78 Repair Record 1978

I

Coef.

[t 957. Conf.

Interval]

—

price Price

I

0.000

-0.000

0.000

length Length (in.)

I

0.013

-0.004

0.029

mpg Mileage (mpg)

I

0.067

0.012

0.123

foreign Car type

I

1.257

0.701

1.813

_cons

I

-0.930

-4.948

3.088

Note in this example how misleading fixed format output may be. Due to limited precision, it can become impossible to say
something about the effect of the price of a car on its repair record. Thus, display formating should only be used after inspection
of results.



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