Stewart, Hayden (contributor); … - 2008
in table 1 during their 2-
week survey period, we express our Engel model for a typical household as:
Y
i
= X
i
β +ε
i …
if X
i
β + ε
i
> 0;
Y
i
= 0 if X
i
β + ε
i
< 0.
where Y
i
is the expenditures of a particular household on a … particular type
of food, X
i
contains a number of independent variables that may explain
those expenditures, βcontains the …