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kate_ptrv's profile
Kate Petrova
Kate Petrova
Kate Petrova
@kate_ptrv

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Kate Petrova

@kate_ptrv

Affective science @Stanford Psychophysiology Lab • @Harvard Study of Adult Development • Studying how we think about and regulate emotions in ourselves + others

kpetrova.com
Joined April 2020

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    Kate Petrova‏ @kate_ptrv 27 Nov 2020

    I couldn’t just walk past this Tweet, so here is some fun #dataviz Scented candles: An unexpected victim of the COVID-19 pandemic 1/n https://twitter.com/TerriDrawsStuff/status/1331362372179554304 …pic.twitter.com/tVecEiX5Jc

    3 R-generated graphs:

1) Top 3 unscented candles 2017-2020 reviews: rating (1-5) on the y axis; date on the x axis; the scatterplot shows a relatively flat line across the three years. N = 1,118

2) Top 3 scented candles 2017-2020 reviews: rating (1-5) on the y axis; date on the x axis; the scatterplot shows a relatively flat line that drops off sharply after January 2020. N = 11,404

3) A bar chart with 11 bars (January-November 2020). Proportion of reviews mentioning lack of scent on the y axis; month on the x axis. January = 2%, February = 3.5%, March = 2.8%, April = 4.6%, May = 3.4%, June = 2.4%, July = 3%, August = 3.2%, September = 3.1%, October = 5.8%, November = 5.8%.
    10:59 am - 27 Nov 2020
    • 13,971 Retweets
    • 35,160 Likes
    • Robert G Alexander Cheryl Edwards Kinolamp FAWAD  KHAN YOUSAFZAI Nora Phillips Y. Sanders 🐘 @nev@bananachips.club Mads Lyhne Haslund curious corn, gilded cage
    338 replies . 13,971 retweets 35,160 likes
      1. New conversation
      2. Kate Petrova‏ @kate_ptrv 27 Nov 2020

        First, I downloaded a random subsample of US-based customer reviews of the 3 most popular scented candles on Amazon. Between January 2017 and January 2020, the average rating stayed around 4.3/5, but there was a sharp drop between January and November 2020. 2/npic.twitter.com/kpCRZ1StKZ

        R-generated graph: Top 3 scented candles 2017-2020 reviews: rating (1-5) on the y axis; date on the x axis; the scatterplot shows a relatively flat line that drops off sharply after January 2020. N = 11,404
        10 replies . 139 retweets 2,050 likes
        Show this thread
      3. Kate Petrova‏ @kate_ptrv 27 Nov 2020

        Could it be because of the COVID-related loss of smell? To investigate, I plotted the reviews of the 3 most popular unscented candles on Amazon*, and the difference was quite striking 3/n *One thing to note: fewer reviews are available for unscented candles than for scented onespic.twitter.com/D9NdknJJAU

        2 R-generated graphs:

1) Top 3 unscented candles 2017-2020 reviews: rating (1-5) on the y axis; date on the x axis; the scatterplot shows a relatively flat line across the three years. N = 1,118

2) Top 3 scented candles 2017-2020 reviews: rating (1-5) on the y axis; date on the x axis; the scatterplot shows a relatively flat line that drops off sharply after January 2020. N = 11,404
        6 replies . 141 retweets 1,865 likes
        Show this thread
      4. Kate Petrova‏ @kate_ptrv 27 Nov 2020

        Since the beginning of 2020, customer satisfaction with scented candles has been dropping at a much faster rate compared to unscented candles. 4/npic.twitter.com/LULlUh9P6W

        R-generated graph: rating (1-5) on the y axis; month (January - November 2020) on the x axis. Linear regression: one line represents unscented candles, another one represents scented candles. Both lines have negative slopes, but the one for scented candles is more steep. R^2 = 0.12 (scented candles); R^2 = 0.018 (unscented candles)
        21 replies . 529 retweets 3,504 likes
        Show this thread
      5. Kate Petrova‏ @kate_ptrv 27 Nov 2020

        That’s where things get really interesting. Instead of just looking at ratings, I decided to dig into the content of these reviews, so I wrote a quick function that flagged all reviews that mentioned lack of scent. 5/n

        4 replies . 41 retweets 1,708 likes
        Show this thread
      6. Kate Petrova‏ @kate_ptrv 27 Nov 2020

        Now, most people were rating their candles without taking the time to write a detailed review, so I expanded my sample to include top 5 scented candles from 4 different brands. 6/n

        4 replies . 34 retweets 1,326 likes
        Show this thread
      7. Kate Petrova‏ @kate_ptrv 27 Nov 2020

        Since the beginning of this year, the proportion of reviews mentioning lack of scent grew from < 2% in January to close to 6% in November. These numbers may not seem like much, but the trajectory of no-scent reviews over the last 11 months is certainly an interesting one 7/npic.twitter.com/K5wEuM0boo

        24 replies . 316 retweets 2,473 likes
        Show this thread
      8. Kate Petrova‏ @kate_ptrv 27 Nov 2020

        So, if you are doing any virtual Black Friday shopping today, and if you still have your sense of smell, maybe buy a scented candle and leave a nice review. And no, I don't work for a candle company. I just like looking at data. 8/n

        50 replies . 73 retweets 2,838 likes
        Show this thread
      9. Kate Petrova‏ @kate_ptrv 27 Nov 2020

        Data + code examples: https://github.com/kateptrv/Candles … Chrome plugin to download your own Amazon reviews data:https://chrome.google.com/webstore/detail/amazon-review-scraper/kpmpdlljfabhiffaoamleakiblkbmmle?hl=en …

        26 replies . 69 retweets 1,651 likes
        Show this thread
      10. Kate Petrova‏ @kate_ptrv 28 Nov 2020

        Kate Petrova Retweeted Moritz Wagner

        https://twitter.com/MoritzWagner20/status/1332728113025966080?s=20 …

        Kate Petrova added,

        Moritz Wagner @MoritzWagner20
        Replying to @kate_ptrv
        Very cool! I just did a quick UK amazon perfume version. Not as nice as yours, but a hint of signal may be there too :) pic.twitter.com/78xUmvnyV9
        15 replies . 35 retweets 630 likes
        Show this thread
      11. End of conversation
      1. Terri Nelson‏ @TerriDrawsStuff 27 Nov 2020
        Replying to @kate_ptrv

        THANK YOU

        0 replies . 0 retweets 17 likes
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