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Author Topic:   Abductive Reasoning In Science
Blue Jay
Member (Idle past 2720 days)
Posts: 2843
From: You couldn't pronounce it with your mouthparts
Joined: 02-04-2008


Message 21 of 120 (672321)
09-06-2012 3:33 PM


Abductive vs Inductive
I'm not sure I quite understand the distinction between inductive reasoning and abductive reasoning. From what I've read here, it sounds like abductive reasoning is sort of a special case of inductive reasoning.
I've understood inductive reasoning to be like this:
All crows I have seen are black
Therefore, all crows are black
And, from what I've understood here about abductive reasoning, it's similar, except that you also propose an explanation for why all crows are black.
So, you're not just extrapolating from a pattern, but you're actually trying to explain the pattern you've seen.
Am I understanding it correctly?

-Bluejay (a.k.a. Mantis, Thylacosmilus)
Darwin loves you.

Replies to this message:
 Message 22 by Panda, posted 09-06-2012 3:59 PM Blue Jay has seen this message but not replied
 Message 24 by Straggler, posted 09-06-2012 4:08 PM Blue Jay has replied
 Message 31 by Dr Adequate, posted 09-06-2012 11:51 PM Blue Jay has replied

  
Blue Jay
Member (Idle past 2720 days)
Posts: 2843
From: You couldn't pronounce it with your mouthparts
Joined: 02-04-2008


(1)
Message 27 of 120 (672328)
09-06-2012 10:51 PM
Reply to: Message 24 by Straggler
09-06-2012 4:08 PM


Re: Abductive vs Inductive
Hi, Straggler.
Strag writes:
Based on a body of evidence and the predictive power of the theory in question having been previously verified we legitimately conclude that another example which fits said theory and it's predictions is explained by said theory.
The new data fits the pattern established by the theory so the theory is abductively concluded to apply to the new data.
You mean, like this:
Black feathers help blackbirds hide in the dark.
Crows have black feathers.
Black feathers help crows hide in the dark
?
Your OP quote says abduction is equivalent to "affirming the consequent," but the above sounds more like "argument from analogy." It sounds to me like abduction is just the action of proposing a hypothesis for a set of observations.

-Bluejay (a.k.a. Mantis, Thylacosmilus)
Darwin loves you.

This message is a reply to:
 Message 24 by Straggler, posted 09-06-2012 4:08 PM Straggler has replied

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Blue Jay
Member (Idle past 2720 days)
Posts: 2843
From: You couldn't pronounce it with your mouthparts
Joined: 02-04-2008


Message 45 of 120 (672396)
09-07-2012 4:48 PM
Reply to: Message 31 by Dr Adequate
09-06-2012 11:51 PM


Re: Abductive vs Inductive
Hi, Dr A.
Dr Adequate writes:
Inductive reasoning goes like this: "I have a theory about how the world works. This theory predicts A, B, and C. I observe A, B, and C. So I shall take this theory to be true until and unless I find a counterexample to this general rule."
Abductive reasoning goes like this: "I have a theory about how the world works (hopefully one confirmed by inductive reasoning). I observe Y. According to my theory, the only possible explanations for Y are X1, X2, or X3. Therefore, one of X1, X2, or X3 must be true."
Oh, so my misunderstanding was more with what induction is: induction is not about explaining an observation at all, but about using observations to verify a theory, while abduction is about using a theory to explain observations.

-Bluejay (a.k.a. Mantis, Thylacosmilus)
Darwin loves you.

This message is a reply to:
 Message 31 by Dr Adequate, posted 09-06-2012 11:51 PM Dr Adequate has replied

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Blue Jay
Member (Idle past 2720 days)
Posts: 2843
From: You couldn't pronounce it with your mouthparts
Joined: 02-04-2008


(1)
Message 55 of 120 (672428)
09-07-2012 10:40 PM
Reply to: Message 51 by RAZD
09-07-2012 7:55 PM


Re: Abductive vs Inductive vs Deductive
Hi, RAZD.
RAZD writes:
... "I always observe P to be true" ...
Would that not be deductive logic?
  • I observe P to be true in case A
  • I observe P to be true in case B
  • ...
  • I observe P to be true in case N (where N is the total number of observations involve)
  • Therefore I always observe P to be true (... so far).
But, you stopped a step early: the inductive step is to then conclude that P is always true, even in cases where you haven't yet made any observations. Of course, inductive conclusions step beyond the empirical evidence, so they are always treated as tentative. That's the whole reason for the principle of tentativity.
-----
AbE: Also, I note that Firefox still doesn't like "consilience," even if you spell it right.
Edited by Blue Jay, : marked addition

-Bluejay (a.k.a. Mantis, Thylacosmilus)
Darwin loves you.

This message is a reply to:
 Message 51 by RAZD, posted 09-07-2012 7:55 PM RAZD has replied

Replies to this message:
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Blue Jay
Member (Idle past 2720 days)
Posts: 2843
From: You couldn't pronounce it with your mouthparts
Joined: 02-04-2008


Message 76 of 120 (672542)
09-09-2012 10:13 AM
Reply to: Message 74 by Dr Adequate
09-09-2012 7:28 AM


Re: Before Abductive, Inductive, or Deductive reasoning ...
Hi, Dr A.
Dr Adequate writes:
Science is not inductive, it's hypothetico-deductive. At best, induction is a description of a psychological phenomenon: if we see the sun rising in the east often enough, we may formulate a general law that that's what it does. But how we get the law is not really part of the scientific method, it's just a fact about how our brains tend to work.
That doesn't sound right to me. Is there a way to arrive at a general law without inductive reasoning?

-Bluejay (a.k.a. Mantis, Thylacosmilus)
Darwin loves you.

This message is a reply to:
 Message 74 by Dr Adequate, posted 09-09-2012 7:28 AM Dr Adequate has replied

Replies to this message:
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