Description Usage Arguments Details Value References Examples
View source: R/loglikelihood.r
Determination of log-likelihood values for the basic distributions covered by R should be ubiquitous, but an implementation is provided here to enable likelihood ratio testing particularly for comparison of 3-parameter optimized models with their 2-parameter counterpart.
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x |
A vector of failure data. |
s |
An optional vector of suspension data. |
Eta |
The scale parameter from a weibull fit. |
Beta |
The shape parameter from a weibull fit. |
This function is somewhat unique among likelihood functions in that it will scan the suspension data for removal of negative values. Such negative values are likely to be entered as data is provided for a 3-parameter fit by explicitly providing the original data with vector subtraction by the optimized t0. The primary intention for likelihood determination is to permit likelihood ratio testing for comparison of 3-parameter optimized models with their 2-parameter counterpart.
Returns a log-likelihood value.
Dr. Robert B. Abernethy, (2008) "The New Weibull Handbook, Fifth Edition" Leonard C. Johnson (1964) "The Statistical Treatment of Fatique Experiments"
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