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Lumifer comments on Open Thread, Jun. 22 - Jun. 28, 2015 - Less Wrong
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I went to the dermatologist and today and I have some sort of cyst on my ear. He said it was nothing. He said the options are to remove it surgically, to use some sort of cream to remove it over time, or to do nothing.
I asked about the benefits of removing it. He said that they'd be able to biopsy it and be 100% sure that it's nothing. I asked "as opposed to... how confident are you now?" He said 99.5 or 99.95% sure.
It seems clear to me that the costs of money, time and pain are easily worth the 5/1000(0) chance that I detect something dangerous earlier and correspondingly reduce the chances that I die. Like, really really really really really clear to me. Death is really bad. I'm horrified that doctors (and others) don't see this. He was very ready to just send me home with his diagnosis of "it's nothing". I'm trying to argue against myself and account for biases and all that, but given the badness of death, I still feel extremely strongly that the surgery+biopsy is the clear choice. Is there something I'm missing?
Also, the idea of Prediction Book for Doctors occurred to me. There could be a nice UI with graphs and stuff to help doctors keep track of the predictions they've made. Maybe it could evolve into a resource that helps doctors make predictions by providing medical info and perhaps sprinkling in a little bit of AI or something. I don't really know though, the idea is extremely raw at this point. Thoughts?
You're probably misreading your doctor.
When he said "99.5 or 99.95%" I rather doubt he meant to give the precise odds. I think that what he meant was "There is a non-zero probability that the cyst will turn out to be an issue, but it is so small I consider it insignificant and so should you". Trying to base some calculations on the 0.5% (or 0.05%) chance is not useful because it's not a "real" probability, just a figurative expression.
Great point. He did seem to pause and think about it, but still a good point. It seems notably likely that you're right, and even so, I doubt that his confidence is well-calibrated.