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- From: dk@imager (Dave Knapp)
- Newsgroups: talk.origins
- Subject: On God and Science
- Message-ID: <144235@lll-winken.LLNL.GOV>
- Date: 22 Dec 92 22:03:46 GMT
- References: <1992Dec18.130553.20138@city.cs> <emc.724948774@kehleyr> <22DEC199200095590@skyblu.ccit.arizona.edu>
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-
- In Article <22DEC199200095590@skyblu.ccit.arizona.edu>
- lippard@skyblu.ccit.arizona.edu (James J. Lippard) writes:
-
- > Surely there are probabilities and evidence we can examine
- > regarding life's origin (e.g., as is done in Robert Shapiro's
- > _Origins: A Skeptic's Guide to the Creation of Life on Earth_).
-
- Actually, Jim, I think Shapiro's arguments are flawed, for two
- reasons: first, his estimates of probability must imply some
- (still speculative) model(s) about the origin of life; the
- probability that the model is correct is left unaccounted-for.
- Second, since I'm not aware of any well-defined way to separate
- "living" from "non-living," so any probability estimated for such
- a transition is equally imprecisely defined.
-
- Real estimates of probabilities require observations, and it's
- a well-known property of statistics that one cannot infer
- anything about probability distributions from a single
- observation. (Actually, that's not true: you can infer that the
- probability for X is non-zero if you observe X.) Estimating the
- magnitude of a probabiliy given a single observation is
- equivalent to estimating the slope of a line given a single
- point.
-
- As far as I know, we have exactly one observation of the
- development of life from non-life, so I think it is fair to say
- that no estimate of the magnitude of the probability is
- justified.
-
- You may respond (as I'm sure Shapiro would) that we have
- observed the formation of precursors to life. But I submit that
- while such an observation is important, as the development of
- these precursors is necessary condition for the development of
- life, it certainly isn't sufficient. Until life is either
- produced experimentally in a laboratory or observed elsewhere in
- the universe, I submit that any estimate of the probability of
- formation of life, whether by a creationist or an actual
- scientist, is purely guesswork.
-
- -- Dave
- --
- *-------------------------------------------------------------*
- * David Knapp dk@imager.llnl.gov (510) 422-1023 *
- * 98.7% of all statistics are made up. *
- *-------------------------------------------------------------*
-