I’m fitting a model, which contains several 2d vectors having the same direction. Currently, I use the very intuitive way to parametrize them: angle = pm.VonMises(...) direction = tt.stack(tt.cos(angle), tt.sin(angle)) coeffs = pm.Normal(..., shape=nvec) vectors = direction * coeffs this kinda wor…

Parametrizing geometric direction

junpenglao March 11, 2018, 10:57am 10

More informative prior for theta (angle) should help, but then more details about your model is needed to know what is a good prior.

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