It can be observed that the variable denoting the category of vehicle is not statistically significant as it yields a p-
value of 0.1902 greater than the risk ߙ of 0.05. In consequence, this variable is excluded from the model and the
analysis will continue in the same manner until it is obtained the optimal combination of factors (p-value < 0.05)
which can explain the variation of claim frequency. After excluding from the model the non significant factors
(category and power of vehicle), it is noticed that all the other explanatory variables are now statistically relevant,
which clearly underlines their influence on the claims frequency.