A Mathematical Programming Approach to Brand Efficiency of Smartphones in the US Market

Table 3

Descriptive statistics ( smartphone-year observations).

	Input	Output
	Price	Q1	Q2	Q3	Q4	Q5	Q6	Q7	Q8	Q9	Q10
Max.	800	5	5	5	5	3	5	5	5	4	5
Min.	500	3	4	2	3	2	2	2	1	1	1
Average	587.75	4.73	4.63	4.54	4.67	2.81	4.05	3.63	3.47	2.98	3.90
SD	86.11	0.48	0.48	0.72	0.54	0.39	0.56	0.75	0.80	0.69	0.86

Note. Q1 = ease of use, Q2 = messaging, Q3 = web browsing, Q4 = display quality, Q5 = voice quality, Q6 = phoning, Q7 = battery life, Q8 = camera image quality, Q9 = camera video quality, and Q10 = portability.