id	keyword
cpos-468	treatment
cpos-468	impact
cpos-468	effect
cpos-468	time
cpos-468	age
cpos-468	data
cpos-468	model
cpos-468	panel
cpos-468	dummies
cpos-468	dummy
cpos-468	function
cpos-468	estimation
cpos-468	group
cpos-468	birth
cpos-468	rst
cpos-468	child
cpos-468	years