Having seen a great many posts about 'troll' results on here, I'm posting some of the data I've complied over the past ten seasons.
I believe it took me about 6 seasons to get a good grasp of how the game worked, the importance of condition, morale, stadium upgrades, counter-formations, etc, etc. I have ignored any results where my tactics may not have been right.
Therefore, the definition of a 'troll' result is any defeat/draw where the tactics are previously proven to be correct and the condition/morale of players is above 90%. There should also be a quality differential of at least equal to the level...so, at level 6, the Q difference was 6 and at level 16, it is 16. This is squad, not first team.
The Cup data is slightly different, as it can be skewed by 'cup specialists' and the fact people are matched with teams of similar Q. Therefore, after season 9, I changed the parameters to any team where I had more than 5 more stars in the starting line-up than the opposition for them to be regarded as a 'weaker' team. Otherwise, I would have not had any data for this competition.
I have also included any matches where there are 3, or more, of what I would call 'unfortunate incidents'...namely a red card, injury or missed penalty, which were then lost as, potentially, a result of these incidents. However, it should be noted that these are quite rare, as I noted a large amount of matches where the disadvantaged team actually emerged victorious.
I'm putting these up now as, quite frankly, I can't be bothered to collate it any longer. As it stands for season 16, I'm several points clear in the league, 5-0 up in the QF of the CL and out of the Cup. I'm quietly hopeful of a league/CL double, but this data is a week shy of a full season.
It's quite clear, from this data, that we should expect c.10% so-called 'troll' results. The average is actually 11.13%. What is interesting to note is that the rates were lower in the less successful seasons. Therefore, if you're getting a few 'trolls' be pleased because it means you're doing well!
Hope people find this useful.