October 2016
25
Be careful : interpretation of results is tricky. There are several signs to take into
account to validate what you measure.
1 / The coefficient of Angström varies very little in one day.
2 / The correlation coefficient R² is an indicator of the coherence of a measure. If
it is less than 0.95, the results must be considered unreliable.
Here we go from fine to coarse particles in 3 hours. A variation of the Alpha of 1.4
is enormous!
The R² of the points of the day oscillate between 0.97 and 0.72, which confirms
the impossibility of interpreting these results.
In this case, Alpha varies from 0.15 in 6 hours and the R² are all close to 1.
The interpretation of the results can be taken into account. It will be possible to
check on websites the presence of particles in the atmosphere of the observation
site :
Prévision de la concentration de poussière (Université d'Athène)
Summary of Contents for CALITOO
Page 49: ...October 2016 49 4 Appendix...
