Palgrave Handbook of Econometrics: Applied Econometrics

537

Table 11.9

Estimated panel data models for doctor visits (standard errors in parentheses)

Variable Poisson

Negative binomial

Pooled(robust s.e.)

Fixed effects Random

effects

Pooled NB2 Fixed effects

Random effects

FE-NB1

FE-NB2

HHG-gamma

Normal

Constant 0.7162

(0.1319)

0.0000

0.4957(0.05463)

0.7628(0.07247)

–1.2354(0.1079)

0.0000

–0.6343(0.07328)

0.1169(0.06612)

Age

0.01844(0.001336)

0.03115(0.001443)

0.02329(0.0004458)

0.01803(0.0007916)

0.02389(0.001188)

0.04479(0.002769)

0.01899(0.0007820)

0.02231(0.0006969)

Educ

–0.03429(0.007255)

–0.03803(0.01733)

–0.03427(0.004352)

–0.03839(0.003965)

0.01652(0.006501)

–0.04589(0.02967)

–0.01779(0.004056)

–0.03773(0.003595)

Income

–0.4751(.08212)

–0.3030(0.04104)

–0.2646(0.01520)

–0.4206(0.04700)

0.02373(0.05530)

–0.1968(0.07320)

–0.08126(0.04565)

–0.1743(0.04273)

Kids

–0.1582(0.03115)

–0.001927(0.01546)

–0.03854(0.005272)

–0.1513(0.01738)

–0.03381(0.02116)

–0.001274(0.02920)

–0.1103(0.01675)

–0.1187(0.01582)

Public

0.2365(0.04307)

0.1015(0.02980)

0.1535(0.01268)

0.2324(0.02900)

0.05837(0.03896)

0.09700(0.05334)

0.1486(0.02834)

0.1940(0.02574)

θ

0.0000

0.0000

1.1646(0.01940)

1.9242(0.02008)

0.0000

1.9199(0.02994)

0.0000

1.0808(0.01203)

a

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

2.1463(0.05955)

0.0000

b

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

3.8011(0.1145)

0.0000

σ

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

0.9737(0.008235)

ln

L

–104440.3

–60337.13

–71763.13

–60265.49

–34016.16

–49476.36

–58182.52

–58177.66