Variables

Probit model

(1)

Heckman selection bias correction

(2)

IV probit model with endogeneity correction

(3)

Control function model without residual interaction term

(4)

Control function model with residual interaction term

(5)

Fertility

0.0235***

0.0546***

0.334***

0.3472***

0.388***

(0.00039)

(0.0007)

(0.0581)

(0.0560)

(0.0546)

Age of the child

0.0143***

0.0327***

0.0518***

0.0423***

0.0576***

(0.00357)

(0.00457)

(0.0067)

(0.0069)

(0.0072)

Age of the square child

−0.0002***

−0.0005***

−0.0006***

−0.0005***

−0.0006***

(0.0001)

(0.0001)

(0.0001)

(0.0001)

(0.0001)

Girl

−0.058***

−0.056***

−0.064***

−0.064***

−0.137***

(0.011)

(0.061)

(0.012)

(0.009)

(0.0347)

Child with diarrhoea

0.169***

0.172***

0.148***

0.148***

0.133**

(0.0392)

(0.0392)

(0.0390)

(0.0383)

(0.0583)

Age of the mother

0.0100

0.0110

0.233

0.233

0.212

(0.0117)

(0.0117)

(0.0627)

(0.0619)

(0.136)

Mother’s age squared

0.001

0.001

0.0002

0.0002

0.0002

(0.001)

(0.001)

(0.0002)

(0.0002)

(0.0002)

Mother with primary education

−0.111***

−0.109***

−0.114***

−0.114***

−0.121***

(0.0362)

(0.0360)

(0.0342)

(0.0338)

(0.0460)

Mother with secondary education and above

−0.450***

−0.431***

−0.431***

−0.431***

−0.495***

(0.103)

(0.102)

(0.0982)

(0.099)

(0.117)

Normal mother’s weight

−0.335***

−0.335***

−0.771***

−0.771***

−0.864***

(0.0723)

(0.0723)

(0.121)

(0.127)

(0.118)

Average household

0.00353

−0.0477

−0.0154

−0.0154

−0.00598

(0.0509)

(0.113)

(0.0487)

(0.0457)

(0.0513)

Rich household

−0.187***

−0.186***

−0.201***

−0.201***

−0.233***

(0.0555)

(0.0551)

(0.0527)

(0.0562)

(0.0588)

Rural areas

0.00279

0.00217

0.0582

0.0582

0.0611

(0.0481)

(0.0473)

(0.0470)

(0.0470)

(0.0638)

Control function variables

Fertility residual

0.218**

0.206**

(0.155)

(0.137)

Fertility multiplied by its residual

0.1661***

(0.0162)

Inverse Mills ratio

−0.0222***

−0.00123***

−0.0295***

(0.0045)

(0.0110)

(0.0224)

Diagnostic statistics

Number of Observations

8441

8441

8441

8441

8441

Pseudo R²

0.1236

Wald chi² [dl; p-value]

255.43 [12; 0.00]

262.33 [13; 0.00]

418.41 [12; 0.00]

261.82 [14; 0.00]

263.57 [15; 0.00]

Rho((ρ)) [robust Standard Error].

−0.989 [0.032]

0.051 [0.0038]

0.071 [0.0019]

0.081 [0.049]

Wald test of indep rho (ρ) = 0 [dl; p-value]

1.56 [1; 0.2121]

Wald exog.chi² test [dl; p-value]

2.75 [1; 0.0032]

5.22 [1; 0.0022]

5.44 [1; 0.019]