Page 135 - Special Topic Session (STS) - Volume 4

(figures 1 and 2).

In case of doubts about the quality of the original data, an enquiry is addressed to our partner, who
STS571 Jaanus Kroon
Monthly results provided by OÜ Position are verified and validated by
Eesti Pank. Along with mobile data, other official data sources are used (e.g.
the number of passengers in the Port of Tallinn and Tallinn Airport, crossings
of the Estonian/EU administrative border, official accommodation statistics,
the press, etc.). The most relevant time series for data validation is provided
by card payment statistics (Figures 1 and 2).

Figure 1: Comparision of different data Figure 2: Comparision of different data
sources sources
(inbound volumes) (outbound dynamics)
500 000 900 000 40%
450 000 800 000
30%
400 000 700 000
350 000 20%
600 000
300 000
500 000 10%
250 000
400 000 0 %
200 000
300 000
150 000 -10%
100 000 200 000
50 000 Nice 100 000 -20% Technical
error
match
0 0 -30%
01.01.15 01.03.15 01.05.15 01.07.15 01.09.15 01.11.15 01.01.16 01.03.16 01.05.16 01.07.16 01.09.16 01.11.16 01.01.17 01.01.16 01.02.16 01.03.16 01.04.16 01.05.16 01.06.16 01.07.16 01.08.16 01.09.16 01.10.16 01.11.16 01.12.16 01.01.17 01.02.17
Overnight visitors (MPD, raw data, OÜ Positium)
Visitors (MPD, raw data, OÜ Positium)
Accommodated tourists (Statistics Estonia) Value of cards transactions (Eesti Pank)
Number of cards transactions (Eesti Pank, right scale, Number of cards transactions (Eesti Pank)
mln)
In case of doubts about the quality of the original data, an enquiry is
addressed to our partner, who carries out his own analysis and, if necessary,
forwards the enquiry to the mobile operators. If the data need to be
corrected, each specific case will be considered separately and adjusted as
appropriate. If it is not possible to identify the specific reasons for the
discrepancy, the data will be corrected based on the data from the same
period of the previous year, multiplied by a coefficient equal to:

o the average increase/decrease of available payment statistics and
other reference data or
o the average change in the last eleven months.
The main inconsistencies in the data relate to a) errors in the source data
files provided by MNOs (missing or invalid data); b) changes in MNOs market
shares or roaming rates; c) under coverage caused by improved availability
of alternative networks (wifi) or d) new sources of noise, incl. overflights. The
data are used as an input for monthly and quarterly external sector statistics
and have been disseminated as official statistics on Eesti Pank’s website on a
quarterly basis since 2012. A press-release on this is attached when
disseminated. Border-crossing statistics is included in the list of Eesti Pank’s
statistical activities, which forms a part of the official statistical programme

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