Skip to main content

Table 1 Regression of call intensity versus population

From: The geography and carbon footprint of mobile phone use in Cote d’Ivoire

Grid Intensity Small population Large population
a 95% CI a 95% CI
5 km × 5 km number of calls 0.05 [−0.04,0.13] 0.87 [0.70,1.03]
duration of calls 0.06 [−0.02,0.14] 0.86 [0.70,1.02]
10 km × 10 km number of calls 0.06 [−0.05,0.17] 1.00 [0.77,1.23]
duration of calls 0.08 [−0.03,0.18] 1.01 [0.78,1.23]
20 km × 20 km number of calls 0.27 [0.11,0.43] 1.24 [0.91,1.57]
duration of calls 0.28 [0.12,0.43] 1.27 [0.93,1.60]
  1. Results of regression to log(intensity)=a log(population)+b. The cutoff between small and large populations is 10,000 for the 5 km × 5 km grid, 20,000 for the 10 km × 10 km grid and 40,000 for the 20 km × 20 km grid. The cutoffs were chosen so that the number of data points in the large population regime are approximately equal (105, 74 and 80 respectively).