seasonality - 2026 ACF Nationals

Packet 7: Tossup 1

Note to moderator: Read the answerline carefully. Note to players: Description acceptable. Unit roots named for this property can be detected by the HEGY (“H-E-G-Y”) test. The X-13-SEATS software accounts for this property, which Burns and Mitchell’s business cycle model accounts for by dividing data by namesake “indices.” This property can be detected by namesake “subseries plots.” The fact that this property has the same effect on employment in Pennsylvania and New Jersey (-5[1])underpinned (-5[2])Card (-5[1])and Krueger’s (-5[2])DID (-5[1])(“D-I-D”) minimum wage study. ARIMA models (10[1]-5[1])adjust (-5[1])for this property with namesake “differencing.” This property and a noise term follow cycle and trend (-5[1])terms in standard time series decompositions. (10[1])The start of construction projects (-5[1])and retail sales exhibit (10[1])annual variation (10[1])named for this property. For 10 points, what property names a form of unemployment (10[2]-5[2])often (10[2])experienced by agricultural (-5[1])workers (-5[1])that rises (10[2])and falls (10[2])at expected times (10[1])of year? (10[2])■END■ (10[7]0[2])

ANSWER: seasonality [or seasonal variation or word forms; accept descriptions of what time of year or what month it is until read until “times of year” is read; prompt on annual variation; prompt on time until “time series” is read; prompt on specific seasons like summer by asking “what kind of period is that?”; prompt on holidays or specific examples like Christmas by asking “the holidays are often said to collectively form what sort of period?”; prompt on descriptions of the weather or temperature; prompt on periodicity or word forms]

<Editors, Social Science> | P. Playoffs 7 (Editors 7)

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Buzzes

Player	Team	Opponent	Buzzpoint	Value
Anuttam Ramji	UC Berkeley B	Maryland A	71	-5
John Marvin	Chicago A	UC Berkeley A	72	-5
Christopher Sims	Northwestern A	Toronto A	72	-5
Orion Keller	Virginia Tech	Harvard	73	-5
Ben Hellman	Swarthmore	Purdue	75	-5
Jaskaran Singh	UCLA	Texas	75	-5
Jason Qin	Columbia A	Indiana	76	-5
Jonathan Huang	MIT	British Columbia	81	10
Ryan Rosenberg	NYU A	Stanford A	81	-5
Oscar Despard	Cambridge	WashU	82	-5
Kevin Zheng	Michigan	Georgia Tech B	98	-5
Jason Zhang	Toronto B	Illinois A	104	10
Ani Perumalla	Penn State	Ohio State	109	-5
Michael Du	Waterloo	UCF	113	10
Coby Tran	Chicago B	Brown	115	10
Jack Lewis	Bruin	Johns Hopkins	129	10
Joseph Chambers	Virginia	Georgia Tech A	129	10
Emerson Patmore	Georgia Tech C	Minnesota	129	-5
Travis Johnson	Pittsburgh	Vanderbilt	129	-5
Brandon Weiss	Columbia B	Rutgers	130	10
Ethan Bosita	Stanford B	NYU B	130	10
Ved Muthusamy	Northwestern B	Cornell	133	-5
Nathan Zhou	Maryland B	Illinois B	134	-5
Joy An	Harvard	Virginia Tech	136	10
Cole Hartung	Georgetown	North Carolina	136	10
Foster Hughes	Minnesota	Georgia Tech C	138	10
Beckett Pursey	Purdue	Swarthmore	138	10
Swapnil Garg	UC Berkeley A	Chicago A	141	10
Benjamin Chapman	Toronto A	Northwestern A	143	10
Michał Gerasimiuk	Stanford A	NYU A	143	10
Charles Hang	WashU	Cambridge	144	10
Jakob Myers	Indiana	Columbia A	144	10
Shardul Parthasarathy	Illinois B	Maryland B	144	10
Rohan Dalal	Georgia Tech B	Michigan	144	10
Pranaav Senthilkumar	Cornell	Northwestern B	144	10
Simon Zimmerman	Ohio State	Penn State	144	10
Alan Wu	Vanderbilt	Pittsburgh	144	0
Jisoo Yoo	Texas	UCLA	144	0
Mattias Ehatamm	Maryland A	UC Berkeley B	144	10

Summary

Tournament	Edition	Match	Heard	Conv. %	Neg %	Avg. Buzz
Main Site	2026-04-17	✓	24	92%	63%	132.45