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Old December 11th 16, 05:11 PM posted to sci.astro
Poutnik[_5_]
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Posts: 68
Default 1) the negative paraxes...

Dne 11/12/2016 v 17:57 Mike Dworetsky napsal(a):


Your suspicion is correct. If you have a list of parallaxes of very
distant objects, so that their parallaxes are on average much smaller
than your limit of detection, then the errors of parallax are
distributed normally, with a bell-shaped curve plotting the likely
distribution of values around a mean of nearly zero. Hence we expect
there to be approximately half of those published parallaxes with values
less than zero and half with values more.

The question remains,
why the data with parallax value within the measurement error
is not replaced by an appropriate note,
instead of publication of noise.

--
Poutnik ( The Pilgrim, Der Wanderer )

A wise man guards words he says,
as they say about him more,
than he says about the subject.
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