3 ms·

I don't understand why they need to be numbered at all. What's wrong with "False Positive" and "False Negative"? They even take less time to say.

abecedarius 8y ago
I have trouble with those too: they're a composition of false/true with positive/negative to denote whether a finding of yes/no is right/wrong, but I can never remember whether false/true corresponds to yes/no or to right/wrong. Just say things like "right yes" or "wrong no" and I'll understand. The only problem with that way of speaking is that it doesn't sound fancy.
- jolmg 8y ago
  > Just say things like "right yes" or "wrong no" and I'll understand. Those have the same problem, don't they? I think you think you're replacing the positive/negative with right/wrong, but you're actually replacing the true/false. So, if you get a "wrong yes" result, is that "yes" supposed to be a good or bad thing? It's still ambiguous. Maybe "true good" or "false bad" are better... Then again, if both results are neither good or bad, then which is which? Maybe true/false positive/negative is indeed the less ambiguous. You just need to be clear on the question that's being answered. "Is there cancer?" "positive" means yes, "negative" means no.
  - abecedarius 8y ago
    We'd have to poll people to really know which terms are more easily remembered. But here's how I'm thinking of it: a test says yes or no: is the thing present or not? And right/wrong is the correctness of the test. I can't see people easily getting confused and thinking "wrong yes" means that a test correctly said that the thing is not there. Anyone would think it means that the test incorrectly said the thing is there (among all the four possible meanings we're concerned about). OTOH false and negative could each more easily mean either wrong or absent. But I may be wrong! This is only my best proposal.
- Kalium 8y ago
  > Just say things like "right yes" or "wrong no" and I'll understand. OK. So s/false/right/ and s/right/true/ and s/negative/no/ and s/positive/yes/. Does that work for you? Positive and negative are about the outcome of the test - did it report whatever or not? True and false are about if this result corresponds to reality or not. It might just be me, but "wrong yes" sounds like it's claiming something very specific about the test. It's claiming that test said something was present and it wasn't. It's possible that this might not align with how the test works. Calling it a false positive would seem to make it clear that it's positive from the test's perspective. But I may be wrong! This is clearly just opinion.
  - abecedarius 8y ago
    I'm not sure I get what distinction you're making. Are you saying that the standard terms don't commit to what we mean by a test's positive/negative, and this generality is more valuable than concreteness? It would be bad to imply too generally that we're talking about a test that says yes or no, a thing is present or absent?
    - Kalium 8y ago
      I'm saying that in my opinion, the standard terms are pretty clear and yes or no create exactly the kind of confusion you're hoping to avoid.
      - abecedarius 8y ago
        Huh. Positive and negative are sort of notorious in medical tests for creating a confusion: positive is often bad! There are actually three dichotomies here: was the test mistaken, what was its boolean value, and which boolean value means which thing in the world. Saying yes/no still requires a decision about the latter; though it seems clearer to me about this (both the need for interpretation and on suggesting a default), but it is subjective. And of course, any of these are better than Type I/II. I do kind of insist that right/wrong or correct/mistaken clearly means the first question, where true/false is more ambiguous. To really resolve things maybe a better idea is like wrong/present and right/absent.

abecedarius 8y ago

I have trouble with those too: they're a composition of false/true with positive/negative to denote whether a finding of yes/no is right/wrong, but I can never remember whether false/true corresponds to yes/no or to right/wrong. Just say things like "right yes" or "wrong no" and I'll understand. The only problem with that way of speaking is that it doesn't sound fancy.

jolmg 8y ago
> Just say things like "right yes" or "wrong no" and I'll understand. Those have the same problem, don't they? I think you think you're replacing the positive/negative with right/wrong, but you're actually replacing the true/false. So, if you get a "wrong yes" result, is that "yes" supposed to be a good or bad thing? It's still ambiguous. Maybe "true good" or "false bad" are better... Then again, if both results are neither good or bad, then which is which? Maybe true/false positive/negative is indeed the less ambiguous. You just need to be clear on the question that's being answered. "Is there cancer?" "positive" means yes, "negative" means no.
- abecedarius 8y ago
  We'd have to poll people to really know which terms are more easily remembered. But here's how I'm thinking of it: a test says yes or no: is the thing present or not? And right/wrong is the correctness of the test. I can't see people easily getting confused and thinking "wrong yes" means that a test correctly said that the thing is not there. Anyone would think it means that the test incorrectly said the thing is there (among all the four possible meanings we're concerned about). OTOH false and negative could each more easily mean either wrong or absent. But I may be wrong! This is only my best proposal.
Kalium 8y ago
> Just say things like "right yes" or "wrong no" and I'll understand. OK. So s/false/right/ and s/right/true/ and s/negative/no/ and s/positive/yes/. Does that work for you? Positive and negative are about the outcome of the test - did it report whatever or not? True and false are about if this result corresponds to reality or not. It might just be me, but "wrong yes" sounds like it's claiming something very specific about the test. It's claiming that test said something was present and it wasn't. It's possible that this might not align with how the test works. Calling it a false positive would seem to make it clear that it's positive from the test's perspective. But I may be wrong! This is clearly just opinion.
- abecedarius 8y ago
  I'm not sure I get what distinction you're making. Are you saying that the standard terms don't commit to what we mean by a test's positive/negative, and this generality is more valuable than concreteness? It would be bad to imply too generally that we're talking about a test that says yes or no, a thing is present or absent?
  - Kalium 8y ago
    I'm saying that in my opinion, the standard terms are pretty clear and yes or no create exactly the kind of confusion you're hoping to avoid.
    - abecedarius 8y ago
      Huh. Positive and negative are sort of notorious in medical tests for creating a confusion: positive is often bad! There are actually three dichotomies here: was the test mistaken, what was its boolean value, and which boolean value means which thing in the world. Saying yes/no still requires a decision about the latter; though it seems clearer to me about this (both the need for interpretation and on suggesting a default), but it is subjective. And of course, any of these are better than Type I/II. I do kind of insist that right/wrong or correct/mistaken clearly means the first question, where true/false is more ambiguous. To really resolve things maybe a better idea is like wrong/present and right/absent.