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Datafile Name: Ice Cream
Datafile Subjects: Consumer
Story Names: Ice Cream Consumption
Reference: Koteswara Rao Kadiyala (1970) Testing for the independence of regression disturbances. Econometrica, 38, 97-117. Also found in: Hand, D.J., et al. (1994) A Handbook of Small Data Sets, London: Chapman & Hall, 214.
Authorization: Contact Author
Description: Ice cream consumption was measured over 30 four-week periods from March 18, 1951 to July 11, 1953. The purpose of the study was to determine if ice cream consumption depends on the variables price, income, or temperature. The variables Lag-temp and Year have been added to the original data.
Number of cases: 30
Variable Names:
  1. Date: Time period (1-30) of the study (from 3/18/51 to 7/11/53)
  2. IC: Ice cream consumption in pints per capita
  3. Price: Price of ice cream per pint in dollars
  4. Income: Weekly family income in dollars
  5. Temp: Mean temperature in degrees F.
  6. Lag-temp: Temp variable lagged by one time period
  7. Year: Year within the study (0 = 1951, 1 = 1952, 2 = 1953)
The Data:
date	IC	price	income	temp	Lag-temp	Year
1	.386	.270	78	41	56	0
2	.374	.282	79	56	63	0
3	.393	.277	81	63	68	0
4	.425	.280	80	68	69	0
5	.406	.272	76	69	65	0
6	.344	.262	78	65	61	0
7	.327	.275	82	61	47	0
8	.288	.267	79	47	32	0
9	.269	.265	76	32	24	0
10	.256	.277	79	24	28	0
11	.286	.282	82	28	26	1
12	.298	.270	85	26	32	1
13	.329	.272	86	32	40	1
14	.318	.287	83	40	55	1
15	.381	.277	84	55	63	1
16	.381	.287	82	63	72	1
17	.470	.280	80	72	72	1
18	.443	.277	78	72	67	1
19	.386	.277	84	67	60	1
20	.342	.277	86	60	44	1
21	.319	.292	85	44	40	1
22	.307	.287	87	40	32	1
23	.284	.277	94	32	27	1
24	.326	.285	92	27	28	2
25	.309	.282	95	28	33	2
26	.359	.265	96	33	41	2
27	.376	.265	94	41	52	2
28	.416	.265	96	52	64	2
29	.437	.268	91	64	71	2
30	.548	.260	90	71		2