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Table 2 VIFs of the performance indicators in the annual PLS SEMs

From: Performance measurement for new mobile data services during generation upgrading period: a case of China’s telecom industry

  VIFs of the annual PLS SEMs
2013 2014 2015
Investment
 I1 investment in wireless access network 2.897 3.121 1.581
 I2 investment in transmission network 4.136 4.171 1.785
 I3 investment in service network 2.022 1.943 1.334
 I4 investment in supporting network 2.288 2.135 1.316
 I5 investment in construction 3.120 2.261 1.245
Supply
 S1 mobile phone exchange capacity 4.443 3.710 4.219
 S2 size of mobile phone base stations 4.744 3.760 4.272
 S3 size of WLAN AP 1.370 1.276 1.315
 S4 dropped call rate of networks per month 1.735 2.312 1.707
 S5 switch rate of networks per month 1.533 1.602 1.497
 S6 switch rate of 2G network per month 1.826 2.391 1.781
 S7 switch rate of 3G network per month 1.378 1.593 1.481
Adoption
 A1 customer size of cellular data service 1.618 1.383 1.301
 A2 customer size of WLAN data service 1.618 1.383 1.301
Usage
 U1 cellular data traffic per month 1.162 1.043 1.025
 U2 WLAN data traffic per month 1.162 1.043 1.025
Revenue
 R1 revenue of cellular data service per month 1.119 1.086 1.046
 R2 revenue of WLAN data service per month 1.119 1.086 1.046