It is clear that the most important factor is the classification of your opponent, but beyond that, how much influence other factors such as your game statistics? How long did the game last? Does the civ you used have a better win rate against your enemy’s civ? if you played better than the average of the players in your ranking? If the map gave you a slight advantage? . I think it is important to know this exactly to be able to use it logistically, for example if you are losing the game and have a very low probability of coming back, it would be better to give up rather than risk continuing to play it so that you lose fewer points due to the influence of the statistics, because Obviously, the more time passes in uneven conditions, the more the graph line disperses.
If someone knows please answer me this, and if someone does not know exactly but has a clearer idea please do not hesitate to discuss.
PD ( the idea may not have been understood because my main language is not English)