time - 2025 ACF Regionals - Buzzpoints App

Question

The Box–Jenkins method can be used to select the parameters of an ARIMA (“uh-REE-muh”) model for data indexed by this variable. For 10 points each:

[10e] Name this variable plotted on the x-axis of namesake “series” of data. Stochastic processes like Brownian motion and stock market returns are often indexed by this variable.

ANSWER: time [prompt on t]

[10h] The Box–Jenkins method uses a variant of correlation denoted by this adjective, which first regresses off data at shorter lags. Similarly, this adjective denotes a regression diagnostics method that plots the response against the added variable, after regressing off all other variables.

ANSWER: partial [accept partial correlation or partial autocorrelation function; accept partial regression]

[10m] An early step of the Box–Jenkins method is to transform or apply differencing to better attain this property. A time series with this property has the same joint probability at any point in time.

ANSWER: stationary [or stationarity]

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Summary


California	2025-02-01	Y	3	10.00	100%	0%	0%
Florida	2025-02-01	Y	3	13.33	100%	33%	0%
Great Lakes	2025-02-01	Y	6	10.00	100%	0%	0%
Midwest	2025-02-01	Y	6	10.00	83%	17%	0%
North	2025-02-01	Y	3	6.67	67%	0%	0%
Northeast	2025-02-01	Y	5	8.00	80%	0%	0%
Overflow	2025-02-01	Y	5	10.00	100%	0%	0%
South Central	2025-02-01	Y	2	10.00	100%	0%	0%
Southeast	2025-02-01	Y	4	7.50	75%	0%	0%
UK	2025-02-01	Y	10	12.00	100%	10%	10%
Upper Mid-Atlantic	2025-02-01	Y	8	12.50	88%	38%	0%
Upstate NY	2025-02-01	Y	3	10.00	67%	33%	0%

Data


UC Berkeley B	Claremont B	10	0	0	10
UCLA	UC Berkeley A	10	0	0	10
Claremont A	UCSD	10	0	0	10
Minnesota B	Wisconsin B	10	0	0	10
Carleton	Wisconsin A	0	0	0	0
Harvard B	BU	10	0	0	10
George Washington B	Columbia B	10	0	0	10
Johns Hopkins A	Columbia C	10	0	10	20
Florida A	Florida State A	10	0	0	10
Florida B	Valencia A	10	0	10	20
Case Western B	Carnegie Mellon B	10	0	0	10
Michigan State	Carnegie Mellon A	10	0	0	10
Ohio State A	Michigan C	10	0	0	10
Georgetown A	Northwestern A	10	0	0	10
Notre Dame B	Georgetown B	10	0	0	10
Notre Dame A	Iowa	10	0	0	10
Northwestern B	Stanford B	10	0	0	10
Notre Dame C	Purdue	10	0	0	10
Texas B	TAMU	10	0	0	10
Texas A	ASU	10	0	0	10
Binghamton A	RIT B	0	0	0	0
Cornell D	ESF A	10	0	0	10
RIT A	Cornell C	10	0	10	20
UCF B	UCF C	10	0	0	10
Kenyon	Michigan B	10	0	0	10
Michigan A	Michigan D	10	0	0	10
Case Western A	Ohio State B	10	0	0	10
Illinois A	WashU A	10	0	0	10
WashU B	Illinois B	10	0	0	10
Chicago C	Indiana A	10	0	10	20
Chicago D	Indiana B	10	0	0	10
Missoui S&T	Chicago B	0	0	0	0
Missouri	Chicago A	10	0	0	10
Iowa State	Winona State	10	0	0	10
Brandeis A	Brandeis B	0	0	0	0
Dartmouth A	UMass Boston	10	0	0	10
Harvard A	Tufts A	10	0	0	10
MIT A	Brown A	10	0	0	10
Georgia Tech A	Bruin A	10	0	0	10
Alabama A	Georgia Tech B	0	0	0	0
Georgia Tech C	Tennessee A	10	0	0	10
Vanderbilt A	Georgia Tech D	10	0	0	10
Bristol	Imperial B	10	0	0	10
Cambridge A	Imperial A	10	0	10	20
Oxford C	Cambridge B	10	0	0	10
Oxford A	Cambridge D	10	0	0	10
Manchester	Durham	10	0	0	10
Warwick A	NYU C	10	0	0	10
Cambridge C	Oxford B	10	0	0	10
Warwick B	Sheffield	10	0	0	10
LSE	Southampton A	10	10	0	20
Southampton B	Cambridge E	10	0	0	10
Vassar A	Cornell B	10	0	0	10
Maryland A	Haverford B	10	0	0	10
NYU A	Maryland B	10	0	10	20
Haverford A	NYU B	10	0	0	10
John Jay College	Penn A	10	0	10	20
Yale A	George Washington A	0	0	0	0