Places/Stats

Context

See Places-Stats.mozilla

Analysis

Goals:

• Insights into usage of bookmarks history
• Define characteristics for test places databases
• Use open source tools to create and iterate on reproducible analysis of the places stats data set
• [Andyed] Investigate potential to gather updated stats for metrics tracked in historical research (% usage of bookmarks, % new urls visited, etc.)

Toolset

• R
• GGobi

Code

See the Etherpad Page for the scratchpad

Load Data (save https://places-stats.mozilla.com/stats?format=csv locally)

places <- read.csv("...places.csv")

Compute age metrics

places$oldest_stamp = as.POSIXct(strptime(as.character(places$visit_date_oldest),format="%m/%d/%y %H:%M"))
places$newest_stamp = as.POSIXct(strptime(as.character(places$visit_date_newest),format="%m/%d/%y %H:%M"))
places$time_delta = difftime(places$newest_stamp,places$oldest_stamp, units="days")

Tags & Bookmark Metrics

places$bookmark_tagged_pct = (places$bookmark_cnt - places$bookmark_nontag_cnt )/ places$bookmark_cnt
places$folder_cnt_crrctd = places$folder_cnt - places$bookmark_cnt
places$user_of_tags  <- ifelse(places$tag_cnt > 0, c("1"), c("0"))

Other Derived Values

places$percent_visits_new = places$places_visited_unique_cnt / places$moz_historyvisits_cnt
places$pages_per_day = places$moz_historyvisits_cnt / as.numeric(places$time_delta)

Subsets

taggers <- places[places$tag_cnt > 0,]
livemarkers <- places[places$livemark_container_cnt > 0,]
bookmarkers <- places[places$bookmark_cnt>20,]

Improvements to Data Collection

• Add visit_type summation to capture usage of bookmarks and overall visitation patterns (link click, bookmark, etc)
  • select count(*) as N, visit_type from moz_historyvisits group by visit_type
• Compute distribution metrics on Session Length to inform design of trail style history visutalizations
  • sum of square, cubes, and 4th powers provides greater ability to characterize a distribution than min, max, mean, median

Related Research

• Hartmut Obendorf, Harald Weinreich, Eelco Herder, Matthias Mayer. Web Page Revisitation Revisited: Implications of a Long-term Click-stream Study of Browser Usage in: CHI 2007
  • http://vsis-www.informatik.uni-hamburg.de/publications/view.php/280
  • Classifies use of history into 3 tasks: short-term revisits (backtrack or undo), medium-term (re-utilize or observe) and long-term revisits (rediscover)
  • 70% of revisits occur within 1 hour
  • Bookmarks trigger less than 12% of url visits