Table 2.

Description of the variables.

Category	Variables	Description
Published features	Pub_journal	Dummy variable: 1 = peer-reviewed journal, 0 = report/working paper
	Pub_chinese	Dummy variable: 1 = Chinese, 0 = English
Study area	H_region	Dummy variable: 1 = rural, 0 = other (including urban and nation)
Income measure	H_income	Dummy variable: 1 = total income, 0 = total expenditure
Data	D_micro	Dummy variable: 1 = micro-level survey data, 0 = macro-level aggregate data
	D_panel	Dummy variable: 1 = panel, 0 = others
	D_time series	Dummy variable: 1 = time series, 0 = others
Model and method	Model_type Budget_stage	Dummy variable: 1 = demand system, 0 = pragmatic model Dummy variable: 1 = single-stage, 0 = multi-stage
	Model_rank	Dummy variable: 1 = model_rank 3, 0 = model_ rank 2
Per capita income level	lncome	Continuous variable: Log of per-capita annual disposable income
Food group	Staple food, Vegetables and fruit, Meat, Oil and fat, Dairy, Aquatic products, Eggs, Other food	Dummy variable: 1 = * food, 0 = others
Nutrient group	Protein, Fat, Vitamin, Minerals	Dummy variable: 1 = * nutrient, 0 = others
Interaction *	* lnincome	Interactions between individual food or nutrient dummy variables (represented by *) and logarithms of per capita income

Note: Individual food or nutrient dummy variables (represented by *)