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 pinboard, occasionally tweet things, post random tidbits on tumblr, and share photos on flickr.
my latest geek tips, also available on twitter, tumblr, or as plain text:
20.07.21.17. rstats: group by all column but one with dplyr http://bit.ly/2uHEU0S
20.07.21.17. rstats: use group_by_at(df, vars(col1:colN)) to group by a range of co columns http://bit.ly/2uHDMu8
20.07.18.17. rstats: use df %>% print(n = k, width = Inf) to print k rows of a tibble and all columns
20.07.18.17. rstats: control the number of columns shown from a tibble with options(tibble.width = Inf) http://bit.ly/2uEQHNZ
20.06.29.17. rstats: use alt-shift-k for a list of rstudio keyboard shortcuts (h/t @jenitive_case, @hadleywickham)