Page 142 - Special Topic Session (STS) - Volume 4

STS571 Sarpono et al.
the number of foreign SIM card holders, regardless of whether the card
holders are local residents or foreigners. It is also necessary to calculate the
ratio of foreign residents who are not recorded in MPD because they do not
carry mobile phones or replace their SIM cards with local SIM cards (not
roaming). All the above ratios will be used as a correction factor in calculating
the number of visits by foreign tourists by MPD. To facilitate the calculation of
the additional number of foreign tourists from the MPD, we then made a
formula that includes all the above correction factors:

Where

AT = Additional Tourism

MPD = Number of SIM cards detected by MNO (Telkomsel) in the
border area

X roam = The ratio of foreign SIM cards per person that actively roaming;
PNR = The ratio of foreign residents with foreign SIM cards who turn
off their phone, roaming or switch to local SIM card to total
number of foreign residents with foreign SIM cards.

MS = Market Sharing
WCI = Number of tourists entering through Immigration Post

3. Results
As mentioned above, BPS Statistics Indonesia conducted cross-border
mobile usage survey for inbound tourists at the border area. This survey is
conducted by BPS Statistics Indonesia, in collaboration with the Ministry of
Tourism, to obtain the ground truth of mobile positioning data, to know the
behavior of border crosser in using their mobile and to obtain ratio/proportion
for the formula.

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