“Or if you don’t like the Silver Bulletin or 538 or RealClearPolitics averages, I’ll offer another alternative. Make your own average. Seriously, it’s not that hard. But I do have one stipulation: you have to publicly specify the rules ahead of time. I think you’ll find that when you’re forced to be consistent, to set standards that aren’t governed by your ad hoc sense of the vibes or by your partisan preferences, you’ll have a lot more sympathy for the polling aggregators — and you won’t be as surprised when one of the outliers turns out to be right”
https://www.natesilver.net/p/trust-a-pollster-more-when-it-publishes