I wonder how many "single bit errors" are due to hardware faults vs. how many are due to software accidentally setting/unsetting a single bit binary flag throug

I wonder how many "single bit errors" are due to hardware faults vs. how many are due to software accidentally setting/unsetting a single bit binary flag through a wild pointer. It would also be interesting to know what percentage of the errors were a zero-to-one flip vs. a one-to-zero, and how well this matches with the expectation of the direction of actual single-bit hardware errors (which I also don't know). Actually, it's also interesting to know which bits were more likely to change; presumably hardware errors are distributed evenly over the eight different bits of a byte, while one might guess that flag bits erroneously (re)set by software might be more likely to be in the low end of a byte.