i am a senior research scientist at microsoft research in new york city, where my work in the area of computational social science involves applications of statistics and machine learning to large-scale social data. i was previously a member of the social dynamics group at yahoo! research. i received my ph.d. from columbia university's physics department where i am an adjunct professor in the applied math department. please see my resume for more project and background information.

this site serves several purposes, from presenting and organizing my current research and teaching efforts to publishing code and tips that i hope others will find useful.

i bookmark lots of references on delicious, occasionally tweet things, post random tidbits on tumblr, and share photos on flickr.

latest tips

my latest geek tips, also available on twitter, tumblr, or as plain text:

apache applescript awk bash c c++ consumer css cu cvs debian emacs excel firefox flickr gcc gentoo git gmail google grammar graphviz hadoop html idvd imagemagick iphone iphoto ipod irc itunes java javascript keynote latex lifehack linux mac macosx matlab meta mobile mturk mysql network networking perl php python quicktime razr rss rstats rsync ruby safari sed sge shell silverlight sms sql ssh svn test trac treo unix video windows word wordpress x11 xml mturk: use boto to extract results / answers http://bit.ly/2aZYIU9 rstats: a regex to extract factor variable names and levels from tidy model data frames http://bit.ly/2aVjDbI rstats: use expand_limits to change default ranges on factors and colors http://bit.ly/2aVjMf5 rstats: use rbindlist to quickly combine large data frames http://bit.ly/2aVikcX rstats: use relevel to set the default reference level for factors in models http://bit.ly/2aVhxZp