Likelihood ratio test statistic - H0: all betas = one.

1 | ```
lrt(x, M = 40)
``` |

`x` |
n (no. of items) x N (no. of methods) matrix or data.frame containing the measurements. N must be greater than 3 and n > N. |

`M` |
Maximum no. of iterations for convergence. |

See Jaech, pp. 204-205.

`n.items ` |
No.of items. |

`N.methods ` |
No. of methods.' |

`beta.bars ` |
N vector of estimated betas. |

`lambda ` |
Chi-square test statistic. |

`df ` |
Degrees of freedom for the test (N-1).' |

`p.value ` |
Empirical significance level for the observed test statistic.' |

Richard A. Bilonick

Jaech, J. L. (1985) *Statistical Analysis of Measurement Errors*. New York: Wiley.

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