nbh_chk {RIPSeeker} | R Documentation

## Check the parameters of the negative binomial HMM

### Description

The function verifies the numerical range and dimension of the NBH paramters alpha, beta, and TRANS and returns the number of hidden states. It is used in `nbh_em` before running EM.

### Usage

    nbh_chk(TRANS, alpha, beta)

### Arguments

`TRANS` | Expected a squared matrix of probabilities (0 ≤ p ≤ 1) with row and column length equal to that of alpha and beta and row sum and column sum both equal to 1 (within some numerical deviation of 1e-6).
`alpha` | Expected a vector of positive values with length equal to that of beta and the row/column of TRANS.
`beta` | Expected a vector of positive values with length equal to that of alpha and the row/column of TRANS.

### Value

`N` | Number of components or equivalently the length of alpha, beta, or wght.

### Author(s)

Yue Li

### References

Bishop, Christopher. Pattern recognition and machine learning. Number 605-631 in Information Science and Statisitcs. Springer Science, 2006.

Capp\'e, O. (2001). H2M : A set of MATLAB/OCTAVE functions for the EM estimation of mixtures and hidden Markov models. (http://perso.telecom-paristech.fr/cappe/h2m/)

### See Also

`nbh_em, nbm_chk`

### Examples

    # two hidden states
    TRANS <- matrix(c(0.9, 0.1, 0.3, 0.7), nrow=2, byrow=TRUE)

    alpha <- c(2, 4)

    beta  <- c(1, 0.25)

    nbh_chk(TRANS, alpha, beta)

[Package RIPSeeker version 1.24.0 Index]