We are going to fit the following Our hypothesis is that both child and equation maternal characteristics affect child ategories will be more likely to have In -P(Ysj) =a,+bX,+b,X,++bX healthier children. Prolonged duration of l-P(Y≤j breastfeeding is associated with increased obability of being healthy of a child. The practice of discrimination against girl Dependent variable suggests that a girl child is more likely to alth status. denoted as health4 be in a worse status of health than a boy (4 categories: healthy, basically healthy, sick or ild Independent variables The ordinal logistic regression equation in our exampl Pa Bfeed: duration of breastfeeding, an interval variable P(Ysj=bMac+b Par_mum+b,Bfeed Urban: place of residence, 1 if urban, 0 otherwise PY≤j b, Chdsex +b Urban+b Han Primary. 1 if primary school, 0 otherwise +b, Primary +byJumior +bg Sencol junior. 1 if junior middle school, 0 otherwise Sencol: 1 if senior middle school and over. 0 otherwise9 17 We are going to fit the following equation: 11 2 2 ( ) ln ... 1( ) j n n PY j a bX bX bX PY j ⎡ ⎤ ≤ = + + ++ ⎢ ⎥ ⎣ ⎦ − ≤ Dependent variable: health status, denoted as health4 (4 categories: healthy, basically healthy, sick or disabled, and dead). 18 • Independent variables: MAC: Maternal age at childbearing, an interval variable Par_num: parity, an interval variable Bfeed: duration of breastfeeding, an interval variable Chdsex: child sex, 1 if a girl, 0 otherwise Urban: place of residence, 1 if urban, 0 otherwise Han: 1 if Han, 0 otherwise Primary: 1 if primary school, 0 otherwise Junior: 1 if junior middle school, 0 otherwise Sencol: 1 if senior middle school and over, 0 otherwise 10 19 • Our hypothesis is that both child and maternal characteristics affect child survival. Women in higher socio-economic categories will be more likely to have healthier children. Prolonged duration of breastfeeding is associated with increased probability of being healthy of a child. The practice of discrimination against girls suggests that a girl child is more likely to be in a worse status of health than a boy child. 20 The ordinal logistic regression equation in our example: 12 3 4 56 7 89 ( ) ln _ 1( ) PY j b Mac b Par num b Bfeed PY j b Chdsex b Urban b Han b Primary b Junior b Sencol ⎡ ⎤ ≤ =+ + ⎢ ⎥ ⎣ ⎦ − ≤ + ++ + ++