Table 2 The definition of variables
Variable group | Variable | Definition |
|---|---|---|
Dependent variable | total revenue | The logarithmic form of monthly total revenue |
Independent variable | store | =1 if the application is published on Apple’s App Store; =0 otherwise |
Moderators | in-app | = 1 if the developer adopts in-app purchase strategy; =0 otherwise |
HHI | The Herfindahl-Hirschman Index multiplied by 10,000 | |
Control variable | apps | The logarithmic form of the number of applications the same developer has previously published |
type | =1 if the application is published by an enterprise developer; =0 otherwise | |
downloads | The logarithmic form of monthly downloads | |
size | The logarithmic form of app size in MB | |
languages | The logarithmic form of the number of language versions of the application | |
updates | The logarithmic form of the monthly number of accumulated updates |