Pandemic education history poster??

Yesterday, I presented a poster on this blog series at the Association for Education Finance and Policy, in Denver, and I had a challenge: how does one present a broad-brush historical argument in this format? So I hacked the idea of a poster, which is to present a limited amount of information as an entree to a discussion with people who decide they’re interested in the topic… and created a chart thematically tied to this series, rescaled to show proportionate changes (with the bottom of the chart representing the greatest proportionate loss 2020-2023 from the 2019 baseline), but without labeling the data:

Figure showing three unlabeled time series of data for 2019-2022, scaled to show proportionate drops -- blue and orange lines sharp in March 2020, slowly rising back up to 2019 baseline, and a gray line representing data that reached highest proportionate drop in early 2022.
Data from three pandemic series of data, 2019-2022

I used the majority of the poster space for this figure, added the poster title, a QR code tied to the first entry in this series, and added some whimsical and clearly false labels to the series on sticky notes: bear spray sales, time spent not on Twitter, and good hair days.

Poster with chart from prior figure, with three yellow stickies representing obviously-wrong identification of time series.
Image of poster at start of AEFP poster session, March 24, 2023. Sticky notes are Sherman Dorn’s obviously-wrong labels.

I invited fellow AEFP attendees to make guesses and label the data. I answered questions without giving away the store, and here is how the poster looked at the end of the session:

Poster with chart from first figure, with sticky notes representing AEFP attendees' guesses on data sources.
Dorn AEFP poster at end of poster session, March 24, 2023. Sticky notes are AEFP attendees’ guesses as to data sources.

And of course I promised to reveal what the actual sources were. Here’s the labeled figure:

Figure showing three unlabeled time series of data for 2019-2022, scaled to show proportionate drops -- blue OpenTable Reservation line and orange women's labor force participation line sharp in March 2020, slowly rising back up to 2019 baseline, and a gray line representing Illinois fourth-grade math MAP median normed percentile that reached the greatest proportionate drop in early 2022.
Data on student achievement in math, women’s labor force participation, and restaurant use, 2019-2023

Sources:

When I downloaded the OpenTable reservation data and arbitrarily picked the 20th of each month, the Mother’s Day spike of 2021 became obvious, and I decided to leave it as a tantalizing hint. The Illinois MAP data has a large gap for 2020 when no periodic testing happened, and I thought that along with the persistence of the drop, that was going to be obvious to someone who looked at the figure. But no one guessed that. I forget who guessed that the orange line was about labor-force participation, but Chris Marsicano (Davidson College) correctly guessed that the blue line was about restaurants, even if he narrowed it to NYC.

There are a few questions I hope this figure raises, from questions about the basic data (what does the OpenTable data tell us, exactly, or the MAP data?) to the different cadences within a society during and after major disruption, and what else (along with K-12 achievement and women’s labor force participation, to a lesser extent) has the multi-year pandemic effects so evident here?