filename	The original PDF filename from the ACM Digital Library
year	The year of publication, CSCW 2018 online-first edition of PACMHCI is 2017.5
title_from_text	The paper title derived from the paper text, this may be incomplete or also include author names.
lead_author	The lead author of the paper, based on the filename from the ACM DL
num_pages	Number of pages in the PDF
total_words	Total number of words in the paper, defined as tokens between any contiguious space
total_words_nopunct	Total number of words after replacing all punctuation with spaces.
body_len_words	Number of words in the paper's front matter and body, no references and appendices. Calculated with `total_words` method.
body_len_words_nopunct	Number of words in the paper's front matter and body, no references and appendices. Calculated with `total_words_nopunct` method.
body_len_chars	Number of characters in the paper's front matter and body, no references and appendices.
ref_len_chars	Number of characters in the paper's reference section.
ref_len_words	Number of words in the paper's reference section. Calculated with `total_words` method.
ref_len_words_nopunct	Number of words in the paper's reference section. Calculated with `total_words_nopunct` method.
appx_len_chars	Number of characters in the paper's appendix section. Value is nan if no appendix was found.
appx_len_words	Number of words in the paper's appendix section. Calculated with `total_words` method.
appx_len_words_nopunct	Number of words in the paper's appendix section. Calculated with `total_words_nopunct` method.
ref_count_approx	Approximate number of references cited.
words_per_page	Averge number of words (`total_words` method) per page
words_nopunct_per_page	Average number of words (`total_words_nopunct` method) per page
chars_per_word	Average number of characters per word (`total_words` method)
chars_per_word_nopunct	Average number of characters per word (`total_words_nopunct` method)
body_words_nopunct_per_ref_count	Average number of words in the paper per number of references cited.
title_has_quote	1 if title has a single or double quotation mark, 0 if not