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Author Topic:   What is the power of prediction?
Modulous
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Posts: 7801
From: Manchester, UK
Joined: 05-01-2005


Message 1 of 34 (293680)
03-09-2006 1:29 PM


What is a scientific prediction?
wikipedia writes:
In a scientific context, a prediction is a rigorous (often quantitative) statement forecasting what will happen under specific conditions, typically expressed in the form If A is true, then B will also be true. The scientific method is built on testing assertions which are logical consequences of scientific theories. This is done through repeatable experiments or observational studies.
In another thread, discussion about what makes a prediction cropped up. You can see the origins of this thread here.
Part of science is prediction. A scientific theory should make predictions on the nature of the evidence that will be found. Here is an example of a prediction that is relevant to the debate:
"It will be determined to what extent the phylogenetic tree, as derived from molecular data in complete independence from the results of organismal biology, coincides with the phylogenetic tree constructed on the basis of organismal biology. If the two phylogenetic trees are mostly in agreement with respect to the topology of branching, the best available single proof of the reality of macro-evolution would be furnished. Indeed, only the theory of evolution, combined with the realization that events at any supramolecular level are consistent with molecular events, could reasonably account for such a congruence"
Emile Zuckerkandl and Linus Pauling, 1965
To translate. If ToE is true and if Evolution happened then we should see congruence. The theory predicts this congruence, before the congruence is discovered. This is a prediction, we know that classifying organsisms based on cladistics produces basically the same tree as one done using the molecular evidence; there is no reason outside of the ToE why the data is congruent like this.
Faith's response to this, in order to present a contra-opinion was
This is not like REAL science of the sort Robin gave an example of where when something is predicted to happen based on a particular theory it actually does or doesn't happen and you can know for sure from the result that the theory was correct or not.
I'd like to explore this. I guess the question is, what is the power of prediction? When is a prediction the result of real science, and when is it not? Are some predictions better than others? I suspect the specificness of the prediction, and the number of possible ways the data could be go towards some kind of metric to judge how confirming a prediction is of a theory.
Naturally, the focus is specifically in comparing 'real' scientific predictions with ToEs predictions to see if ToE is 'real' science.
Is it Science?(?)/Bio Evo? Probably the former I'd think.
This message has been edited by Modulous, Thu, 09-March-2006 07:12 PM

Replies to this message:
 Message 3 by robinrohan, posted 03-09-2006 2:58 PM Modulous has replied
 Message 4 by ramoss, posted 03-09-2006 3:09 PM Modulous has not replied
 Message 10 by Chiroptera, posted 03-09-2006 3:36 PM Modulous has not replied
 Message 28 by mike the wiz, posted 03-10-2006 8:47 AM Modulous has replied

  
Modulous
Member
Posts: 7801
From: Manchester, UK
Joined: 05-01-2005


Message 13 of 34 (293732)
03-09-2006 3:51 PM
Reply to: Message 3 by robinrohan
03-09-2006 2:58 PM


predicting the future state of a phase-space
A real prediction is a prediction about the future. I predict that a certain space object will be in a particular precise location at a particular time according to my figures based on the theory of relativity.
OK, so if I was able to predict a specific pattern would emerge out of a possible 100,000 patterns using five different methods, would that be a convincing prediction?
What about if I was to predict a very close pattern (within error bounds) out of a possible 1074 patterns, would that be a good prediction? All I would use to do this is the ToE.
What if the possible number of patterns was massively larger than this? Of all the possible outcomes, I can use a theory to predict what general pattern would emerge before even understanding how to employ the method for testing it?
What if I was to predict where in a massive pattern of organisms a given organism would be found? Would that be a prediction? This organism has never been tested before.
We take a look at this object and sure enough it ends up exactly where I said it would. Good evidence for the truth of the theory of relativity.
If predicting where an object will be in space and time is a good prediction, why is being able to predict where an object will appear in a certain 'phase-space' and 'phase-time' not a prediction?
This message has been edited by Modulous, Thu, 09-March-2006 08:54 PM

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 Message 3 by robinrohan, posted 03-09-2006 2:58 PM robinrohan has replied

Replies to this message:
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Modulous
Member
Posts: 7801
From: Manchester, UK
Joined: 05-01-2005


Message 24 of 34 (293886)
03-10-2006 8:10 AM
Reply to: Message 22 by robinrohan
03-10-2006 8:04 AM


predictive power and a repeat question
I think Message 13 is an important one with regards to prediction. You say that predicting where an object will be in space and time is a strong prediction. My question:
If predicting where an object will be in space and time is a good prediction, why is being able to predict where an object will appear in a certain 'phase-space' and 'phase-time' not a prediction?
Another important point is predictive power. A theory doesn't have to predict something that has yet to come about, it merely needs to have been able to have predicted it. Another way of looking at it is that if we give someone some science training and the details of the theory, yet keep them blind to certain data...will they be able to predict what that data should be?

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Modulous
Member
Posts: 7801
From: Manchester, UK
Joined: 05-01-2005


Message 25 of 34 (293887)
03-10-2006 8:14 AM
Reply to: Message 23 by robinrohan
03-10-2006 8:08 AM


Re: predicting the future state of a phase-space
It's hard for me to comment on this without more a notion of what you mean by a "pattern." For example, what?
It really doesn't matter. Consider them 'states' if you will. It could be just a single number. Being able to predict a specific number or even just a small range of numbers 1 out of 1074 would suggest some underlying knowledge about how the number was generated, or incredible luck.

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Modulous
Member
Posts: 7801
From: Manchester, UK
Joined: 05-01-2005


Message 33 of 34 (293954)
03-10-2006 11:29 AM
Reply to: Message 28 by mike the wiz
03-10-2006 8:47 AM


Re: Example: Einstein's famous prediction
I almost brought Einstein's prediction up the OP, but it looked a bit cluttered so I deleted it. The question now is, how does this compare with being able to predict the structure of the relative genetic similarity of all organisms that exist...ten years before the first realistic methods of sequence comparisons came about?
Is Einstein's work 'real' science and the prediction above not 'real' science? What seperates the two?

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