The Football Poisson Distribution on Sporting Statistics looks at the history of goals, both scored and conceded within the last two seasons both as a league in whole and as teams, there is then calculations made based on the averages of these which then produces a chance percentage of amount of goals which the teams will score and concede, from there we can work out the match outcomes in a percentage which is then converted to odds which is compared to the current odds available.
If the current odds available are higher than the Poisson Distribution produced odds then then can be considered as value, of course Poisson Distribution does not consider team selections, current form etc so only use this as a guide and then do your own research into the matches also. Odds which are highlighted are considered value odds based on hidden calculations.