redo_sfilter: redo_sfilter
In ianjonsen/duckConfit: State-space filtering code for RAATD data paper

redo_sfilter() iteratively re-fits the state-space model to tracks that have failed to converge. It iteratively adjusts the values for span and nu and makes tries = n attempts before giving up.

1 2	redo_sfilter(ssm_obj, data, s.inc = 0.1, n.inc = 1, tries = 5, common.tau = FALSE)

`ssm_obj`	output from `sfilter()` - a `tibble` grouped by id or is and stage
`data`	data object provided by `prefilter()`
`s.inc`	increment for `span` argument
`n.inc`	increment for `nu` argument
`tries`	number of attempts to successfully filter all convergence failures before giving up
`common.tau`	(logical) fit SSM with a single SD for measurement error in both lon & lat

redo ssm filter for tracks that failed to converge, trying incrementally different span & nu values. Up to tries re-filter attemps are made. If common.tau = TRUE, function then searches for cases where hat(gamma) > 0.9, deployment < 30 d, device_type == PTT & refits sfilter. This may reduce over-smoothing of these short & typically sparsely observed tracks

ianjonsen/duckConfit documentation built on May 30, 2019, 4:36 p.m.