EventPivotWeak

class poisson_approval.EventPivotWeak(candidate_x, candidate_y, candidate_z, tau)[source]

A 2-candidate weak pivot.

Notes

We consider the weak pivot between x and y, i.e. situations where S_x = S_y >= S_z.

For parameters and attributes, cf. Event.

Examples

>>> from fractions import Fraction
>>> from poisson_approval import TauVector
>>> tau = TauVector({'a': Fraction(1, 10), 'ab': Fraction(6, 10), 'c': Fraction(3, 10)})
>>> event = EventPivotWeak(candidate_x='c', candidate_y='b', candidate_z='a', tau=tau)
>>> event
<asymptotic = exp(- 0.151472 n - 0.5 log n - 0.836813 + o(1)), phi_a = 0, phi_c = 1.41421, phi_ab = 0.707107>
>>> print(event.asymptotic)
exp(- 0.151472 n - 0.5 log n - 0.836813 + o(1))
>>> event.mu
-0.151471862576143
>>> event.nu
-0.5
>>> event.xi
-0.8368125164616638
>>> event.phi_a
0.0