@article {13357,
	title = {Aggregation among Binary, Count, and Duration Models: Estimating the Same Quantities from Different Levels of Data},
	journal = {Political Analysis},
	volume = {9},
	year = {2000},
	pages = {21-44},
	url = {http://pan.oxfordjournals.org/},
	author = {James Alt and G. King and C. Signorino}
}
