Bass Forecasting Tutorial - Appendix (p & q Parameters)

Created by Steve Hoover, Modified on Tue, Aug 6 at 4:18 PM by Steve Hoover

Appendix

This table summarizes the estimated values of the p and q parameters of the Bass model for various product categories. For each product, the reported values here are the average values of these parameters obtained from an exhaustive search of the literature. (Compiled by Christophe Van den Bulte).

CAT1	CAT2	Products	p	q
Agricultural	High p / High q	Artificial insemination	0.014	0.437
Agricultural	High p / High q	Bale hay	0.0095	0.519
Agricultural	High p / High q	Corn	0.0388	1.00534
Agricultural	Low p / High q	Hybrid corn	0.00000001	0.7975
Agricultural	High p / Low q	Tractor	0.0072	0.11795
Consumer Electronics	High p / Low q	Cable TV	0.02116	0.2698
Consumer Electronics	Low p / High q	Calculator	0.00136	0.438
Consumer Electronics	Low p / High q	Camcorder	0.000094	0.4679
Consumer Electronics	Low p / Low q	Cassette deck	0.001	0.2875
Consumer Electronics	High p / High q	CD player	0.0017	0.3991
Consumer Electronics	Low p / High q	Cell telephone	0.00471	0.506
Consumer Electronics	Low p / High q	Cordless telephone	0.002	0.388
Consumer Electronics	Low p / Low q	Digital watch	0.0056	0.3542
Consumer Electronics	High p / High q	Diskdrive	0.0208	0.995
Consumer Electronics	High p / Low q	Kodak instant camera	0.13846	0.00005
Consumer Electronics	Low p/Low q	Laser disc player	0.0025	0.3242
Consumer Electronics	High p / Low q	Polaroid instant camera	0.09228	0.00006
Consumer Electronics	High p / High q	Radio	0.01034	0.4537
Consumer Electronics	Low p / Low q	Recording media (records, cassette tapes, CDs)	0.00874	0.32847
Consumer Electronics	Low p / Low q	Telephone	0.0075	0.082
Consumer Electronics	Low p / High q	Telephone answering machine	0.000000058	0.5443
Consumer Electronics	High p / Low q	Turntable	0.0577	0.21
Consumer Electronics	Low p / High q	TV (Black & White)	0.00064	0.416
Consumer Electronics	Low p / High q	TV (Color)	0.00005	0.648
Consumer Electronics	Low p / Low q	TV (Projection)	0.00512	0.2062
Consumer Electronics	Low p / High q	VCR	0.00015	0.7564
Consumer Electronics	High p / Low q	Videogames	0.01979	0.3066
Household Appliances	High p / Low q	Automatic coffee maker	0.01082	0.22588
Household Appliances	Low p / High q	Blender	0.0000038	0.4726
Household Appliances	Low p / High q	Broiler	0.000000036	0.9668
Household Appliances	High p / Low q	Can opener	0.01924	0.2903
Household Appliances	Low p / HIgh q	Clothes dryer	0.0000014	0.4792
Household Appliances	Low p / Low q	Clothes washer	0.00162	0.2687
Household Appliances	Low p / High q	Coffee maker ADC (Automatic Drip Coffee)	0.000035	0.4086
Household Appliances	High p / High q	Curling iron	0.0603	0.454
Household Appliances	High p / High q	Deep fryer	0.0337	0.74
Household Appliances	High p / Low q	Dishwasher	0.0128	0.1845
Household Appliances	High p / High q	Disposer	0.0101	1.0873
Household Appliances	High p / Low q	Electric coffee maker	0.0215	0.2025
Household Appliances	High p / Low q	Electric knife	0.11495	0.27515
Household Appliances	Low p / High q	Electric range	0.00246	0.4984
Household Appliances	High p / High q	Electric toothbrush	0.11	0.548
Household Appliances	Low p / Low q	Fluorescent lamp	0.0008	0.0546
Household Appliances	High p / Low q	Fire extinguisher	0.0694	0.16
Household Appliances	High p / High q	Food processor	0.0182	0.5633
Household Appliances	High p / High q	Fondue	0.166	0.44
Household Appliances	Low p / High q	Freezer	0.000038	0.3814
Household Appliances	High p / Low q	Frypan	0.2215	0
Household Appliances	High p / Low q	Hair setter	0.1305	0.35
Household Appliances	Low p / Low q	Heating pad	0.0035	0.3463
Household Appliances	High p / Low q	Hot plates	0.0755	0.0715
Household Appliances	High p / High q	Knife sharpener	0.0655	0.5
Household Appliances	Low p / Low q	Lawnmower	0.0000079	0.3091
Household Appliances	Low p / Low q	Microwave oven	0.000004	0.3451
Household Appliances	Low p / Low q	Mixer	0.00011	0.14823
Household Appliances	Low p / Low q	Power leaf blower (gas or electric)	0.013	0.315
Household Appliances	High p / Low q	Range	0.0375	0.0325
Household Appliances	High p / Low q	Range (built-in)	0.04067	0.22651
Household Appliances	Low p / Low q	Refrigerator	0.00037	0.2308
Household Appliances	Low p / High q	Room AC	0.000000044	0.5701
Household Appliances	Low p / Low q	Electric Shaver	0.000098	0.2775
Household Appliances	High p / High q	Slow cooker	0.0436	0.59733
Household Appliances	Low p / High q	Steam iron	0.00012	0.3819
Household Appliances	High p / Low q	Styling dryer	0.0777	0.253
Household Appliances	High p / Low q	Toaster	0.0385	0.131
Household Appliances	Low p / High q	Trash compactor	0.000065	0.9498
Household Appliances	Low p / Low q	Vacuum cleaner	0.00406	0.1805
Household Appliances	High p / High q	Waffle iron	0.0128	0.43
Household Appliances	High p / Low q	Water softener	0.0177	0.29695
Information Technology	Low p / High q	8-bit microprocessor	0.00783	0.58466
Information Technology	High p / Low q	Copying machines	0.01208	0.1456
Information Technology	Low p / Low q	Portable dictation machine	0.00078	0.2141
Information Technology	High p / High q	Mainframe computers (number of units installed)	0.05911	0.38379
Information Technology	High p / High q	Mainframe computers (units of computing performance)	0.02845	0.72294
Information Technology	Low p / High q	PC Printer	0.00071	0.8037
Information Technology	Low p / Low q	Personal Computer (PC)	0.00306	0.2532
Information Technology	High p / High q	Static Random Access Memory (SRAM) chips	0.02562	1.10136
Information Technology	High p / Low q	Supercomputer	0.07063	0.17513
Information Technology	Low p / High q	Fax	9.10E-09	0.766
Information Technology	Low p / High q	Linked-In	0.00234	0.58383
Information Technology	Low p / High q	3-D Printers	0.00403	0.54646
Medical	High p / High q	CT scanner for head only	0.0411	1.0896
Medical	High p / High q	CT scanner for whole body	0.0335	1.3895
Medical	High p / High q	CT scanners (all types for hospitals with 50-99 beds)	0.04	0.461
Medical	High p / Low q	CT scanners (all types for hosptitals with >100 beds)	0.035	0.261
Medical	Low p / High q	Mammography	0.00494	0.70393
Medical	High p / Low q	Population using florinated water (community adoption)	0.2648	0.3352
Medical	Low p / High q	Ultrasound imaging (adoption by hospitals)	0.00312	0.50625
Medical	High p / Low q	Antihypertensive	0.04476	0
Medical	Low p / High q	Beta Blockers	0.00206	0.50323
Medical	High p / Low q	Diuretic	0.011	0.066
Other Products	Low p / Low q	Bed cover	0.00566	0.15109
Other Products	Low p / Low q	Electric Blanket	0.000057	0.2489
Other Products	HIgh p / Low q	Boat trailer	0.0088	0.37585
Other Products	High p / Low q	Diaper	0.0238	0.2684
Other Products	High p / High q	Drillbit for oil wells	0.1102	0.4154
Other Products	Low p / High q	Milkpack (containers for milk)	0.00079	0.39606
Other Products	Low p / Low q	Nylon cord	0.00415	0.2335
Other Products	Low p / High q	Oxygen steel furnace (USA)	0.001	0.456
Other Products	High p / Low q	Plastic milk containers (1 gallon)	0.0123	0.3327
Other Products	High p / Low q	Plastic milk containers (half gallon)	0.0114	0.3007
Other Products	Low p / High q	Retail scanner equipment (POS Scanners)	0.00392	1.17359
Other Products	High p / Low q	Structural wood panel (plywood, waferboard)	0.01656	0.03535
Other Products	High p / High q	Styling mousse	0.2028	0.9864
Other Products	High p / Low q	Toothbrush	0.0826	0.13
Other Products	Low p / Low q	Universal Product Code (UPC)	0.0076	0.1808
Services	Low p / High q	AOL (change in subscriptions)	0.00018	1.1827
Services	Low p / Low q	Solar energy (BTU generated)	0.00112	0.0719
Services	Low p / High q	Cable TV (change in subscription)	0.0000061	0.5012
Services	Low p / High q	Accelerated program (educational innovation)	0.00262	0.91303
Services	Low p / High q	ATM machines (adoption by banks)	0.00053	0.4957
Services	Low p / High q	Foreign language (educational innovation)	0.0034	0.6186
Services	High p / Low q	HoJo (Number of restaurants)	0.0208	0.25762
Services	High p / High q	McDonalds (Number of restaurants)	0.01801	0.53817
Services	High p / Low q	Motel	0.0109	0.3379
Services	High p / High q	Phone banking	0.0143	0.88378
Services	High p / Low q	Satellite TV (change in subscriptions)	0.04693	0.3346
Transportation	High p / High q	Electronic Fuel Injection (Proportion of car models)	0.00878	0.576
Transportation	Low p / Low q	Diesel cars in Europe (Proportion of new cars)	0.0037	0.1706
Transportation	Low p / Low q	ABS (Antilock Braking) (Proportion of cars sold)	0.0026	0.2056