id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
cpos-333	Champion, Tony	Updating Ravenstein: Internal Migration as a Driver of Regional Population Change in the Wider South East of England	2020	23	.pdf	application/pdf	11447	348	54	It comprises two sets of empirical analyses using migration data for the period 2001- 2016. 3.2 Data and methods This study addresses these questions using migration data for 2001-2016 derived from the NHS’s Patient Register Data System (PRDS) by Offi ce for National Statis- tics (ONS), which compares people’s addresses – as notifi ed to their doctors – be- tween annual downloads and therefore records population movement in the form of yearly address transitions.	cache/cpos-333.pdf	txt/cpos-333.txt