Biomedical Engineering Reference
In-Depth Information
Table 18.3
Estimation results
Variable
Estimate
Std. error
p
-Value
(A) Market type
Stage in product life cycle
Late
Early
0.742
0.123
<0.0001
Geographic setting
Europe
USA
0.019
0.074
0.795
Early stage X USA
−0.285
0.086
0.001
(B) Dataset characteristics
Trend
Year of data collection (mean-centered)
0.002
0.004
0.567
Early stage X year of data collection
−0.023
0.008
0.003
Sales output measure
Absolute
Relative
0.073
0.063
0.251
Temporal aggregation
Monthly
Quarterly
0.373
0.138
0.010
USA X quarterly
−0.344
0.145
0.018
Yearly
−0.071
0.175
0.685
(C) Researcher choices
Consideration of dynamics
No lagged effects
Independent variable lagged
−0.155
0.055
0.008
Dependent variable lagged
−0.118
0.063
0.069
Endogeneity in sales response
Not accounted for
Accounted for
0.047
0.056
0.399
Early stage X accounted for
−0.193
0.101
0.057
Heterogeneity in sales response
Not accounted for
Accounted for
−0.062
0.064
0.343
Promotions variable
Omitted
Included
0.097
0.060
0.105
Early stage X included
−0.315
0.086
0.001
Advertising variable
Omitted
Included
−0.106
0.059
0.073
Interaction effects
Omitted
Included
0.196
0.056
0.001
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