I’ve been doing crossword puzzles on my iPad over breakfast (usually oatmeal) for the past few years. I got a subscription to the weekly American Values Club crosswords and would also do some free puzzles. Last year, I went in for a subscription to the New York Times crossword puzzles when they were having a discount, and I’ve been doing those almost daily.
The NYT crossword is bit stricter than my general iPad Crosswords app. For instance, the NYT app doesn’t make it easy to look up clues via Google, which is odd since their solving guide touts “It’s not cheating, it’s learning” and quotes a former editor saying, “It’s your puzzle. Solve it any way you like.” And you can’t check your answers until the next day.
After each puzzle solved, the NYT app will tell you your time and solving streak (only counting same-day solves), which does provide a little extra motivation. I’ve often wanted a download button to get access to my past data to measure the day-of-week difficulty increase and to track progress over time. Only recently I realized that each day’s puzzle has a unique URL and I could visit past puzzles, solved or still in progress. And that made me look for a way to automate those visits to collect my timing data and solved status.
Looking at the entire 16 months of data doesn’t show much, except that there were more at the beginning that I didn’t even start (those red x marks along the bottom). Zooming in on recent times, you can get a sense of the daily difficulty pattern.
Breaking out the weekdays, you can see both how the difficulty increased throughout the week and maybe that I’ve been improving over time.
The trend lines are only based on the solved puzzles. There exist statistical techniques to incorporate the unsolved times into the trend by treating them as censored values, but I didn’t have much luck with it, apparently because I often gave up early and with irregular amounts of effort in general.
The week-end puzzles are harder and/or bigger and I put them on a separate scale. Looks like I’m not improving too much on these. ?
I shared these images and more on Twitter last month, and my data is available as crossword_times.csv on GitHub and in interactive form on JMP Public, where you can filter by day of the week, for instance.