Difference in DifferencesComparing change over time between a treated and untreated group.EconomicsThe design.1Identify treated and control groupsOne receives the policy, one does not.2Measure both beforeEstablish the pre-treatment levels and trends.3Measure both afterSame outcomes, same measurement.4Difference twiceChange in treated, minus change in control.5Check parallel trendsDid they move together before the treatment?The parallel trends assumption is what the design rests on. Plot thepre-period; if trends diverge, the estimate is not credible.Difference in Differenceslearnposters.com
Difference in Differences — printable business wall chart from LearnPosters. Free vector PDF, US Letter and A4.

Difference in Differences, step by step

The design.

  1. Identify treated and control groupsOne receives the policy, one does not.
  2. Measure both beforeEstablish the pre-treatment levels and trends.
  3. Measure both afterSame outcomes, same measurement.
  4. Difference twiceChange in treated, minus change in control.
  5. Check parallel trendsDid they move together before the treatment?

The parallel trends assumption is what the design rests on. Plot the pre-period; if trends diverge, the estimate is not credible.

Questions about the Difference in Differences poster

What’s on the Difference in Differences poster?
5 numbered steps. The design. Identify treated and control groups — One receives the policy, one does not.; Measure both before — Establish the pre-treatment levels and trends.; Measure both after — Same outcomes, same measurement.; Difference twice — Change in treated, minus change in control.; Check parallel trends — Did they move together before the treatment?. The parallel trends assumption is what the design rests on. Plot the pre-period; if trends diverge, the estimate is not credible.
Who is the Difference in Differences poster for?
Difference in Differences belongs to the Economics section rather than to a school year, because business is not something one grade owns. Anyone learning econometrics can pin it up — a beginner, a student mid-course, or someone revising years later.
When should you use the Difference in Differences poster?
Differencing removes anything fixed about each group and any shock common to both. A wall chart earns its place by being glanceable from where the work is happening, so Difference in Differences belongs on the wall where that business work actually happens, within glancing distance, rather than filed away.
What other posters go with Difference in Differences?
Correlation & Causation, Economic Data and Forecasting sit alongside Difference in Differences in the Economics section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Correlation & CausationEconomic DataForecasting
Is the Difference in Differences poster free to download and print?
Yes. Difference in Differences downloads as a free PDF with no account, no email and no watermark, like everything else in the Economics section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the Difference in Differences poster print at?
Difference in Differences is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Difference in Differences loses nothing.Printing guide

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