Is it right for the big estimation error of alpha in this example?

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Robert Willy

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Dec 14, 2015, 11:02:06 PM12/14/15

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Hi,
I learn MCMC by pymc Python package with this link:
https://users.obs.carnegiescience.edu/cburns/ipynbs/PyMC.html

In the random source, it has: alpha_true = 0.5, but the result of alpha
is about 1. The estimation error is really big comparing with other
estimation. Can you give me some explanation on this difference?