log_lik_dual: log_lik_dual
In jtm508/bayestraj:

Compute log likelihood of data for dual latent trajectory model

1 2	log_lik_dual(X1, X2, y1, y2, pi1, pi1_2, beta1, beta2, sigma1, sigma2, id1, id2)

`X1:`	Matrix, design matrix group 1
`X2:`	Matrix, design matrix group 2
`y1:`	Vector, outcomes group 1
`y2:`	Vector, outcomes group 2
`pi1:`	Vector, group probabilities group 1
`pi1_2:`	Vector, transition probabilities from group 1 to group 2
`beta1:`	Matrix, likelihood coefficients group 1
`beta2:`	Matrix, likelihood coefficients group 2
`sigma1:`	Float or vector, likelihood variance group 1
`sigma2:`	Float or vector, likelihood variance group 2
`id1:`	Vector, id for each observation group 1
`id2:`	Vector, id for each observation group 2