`confint,rateReg-method`

is an S4 class method for
`rateReg`

object, which returns approximate confidence intervals
for all or specified covariates.

## Usage

```
# S4 method for rateReg
confint(object, parm, level = 0.95, ...)
```

## Arguments

- object
A

`rateReg`

object.- parm
A specification of which parameters are to be given confidence intervals, either a vector of numbers or a vector of names. If missing, all parameters are considered.

- level
An optional numeric value to specify the confidence level required. By default, the value is 0.95, which produces 95% confidence intervals.

- ...
Other arguments for future usage.

## Details

Under regularity condition (Shao 2003, Theorem 4.16 and Theorem 4.17, page 287, 290), the approximate confidence intervals are constructed loosely based on Fisher information matrix and estimates of coefficients.

## References

Shao, J. (2003), *Mathematical statistics*,
Springer texts in statistics, New York: Springer, 2nd Edition.

## See also

`rateReg`

for model fitting;
`coef,rateReg-method`

for point estimates
of covariate coefficients;
`summary,rateReg-method`

for summary of a fitted model.