fit_data.lifedata: Fit Distribution to lifedata Object
In lxy009/weibullpp: weibullpp

Description Usage Arguments Details Value See Also

Fits a distribution to lifedata object using either MLE or rank regression. Only weibull and exponential distributions are available.

1 2	## S3 method for class 'lifedata' fit_data(x, dist = "weibull", method = "mle")

`x`	a lifedata object
`dist`	character indicating distribution. only exponential and weibull are available
`method`	which method to estimate parameters of distribution. can be mle, rrx, or rry. see details.

When method = 'mle', uses optim function to find MLEs. The only exception is for the exponential distributions, which uses the analytic solution. For rank regression, 'rrx' and 'rry' mean rank regression with least-square distance in x and y, respectively. For rank regression, ranks are calculated by median_ranks.lifedata.

Standard errors are calculated based on Fisher matrix estimation. The matrix comes from the Hessian output from optim.

A fitted_life_data object. Object includes original input lifedata object, the distribution fitted, log likelihood, parameter estimates. If all data points are complete, a chi-square goodness-of-fit output is included as well.

median_ranks.lifedata optim

lxy009/weibullpp documentation built on May 21, 2019, 9:16 a.m.