tT – average air temperature
R – the difference in the price of gasoline between the average for the category
N – power network N=F(Q,L)
Q – number of filling stations
L – average Strait at each station for the entire period
S-1 – the Strait in the previous month,
a, s, k, - const – coefficients of the model
AdStock is the accumulated effect of advertising
Promo – the presence of promotions, 1 (present) or 0 (no)