Here is how this works. Write down as many predictions as you can think of. They dont necessarily have to be things you think will happen, just things that could happen. Next, for each prediction, give your most sincere guess as to what the probability is that it will occur. If you think theres a 50% chance of it happening then you should assign it 50% (Assign 30% to 30% likely ones, 80% to 80% likely ones, etc).
Calibration predictions are a way of measuring your own objectivity about future events. If I were truly objective in my expectations about the future, then 50% of the things I expect to have 50% probability of occuring, should occur. If 90% of the things I think have a 50% chance of happening, then something is way off in how I am thinking about the world. If you were objective, then you would see things like 90% of the ones rated "90% likely" would come true.
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