summary.ldPower {ldbounds}

Summary for Computations Related to Group Sequential Boundaries

Description

'summary' method for class '"ldPower"'.

Usage

## S3 method for class 'ldPower'
summary(object, ...)
## S3 method for class 'summary.ldPower'
print(x, digit = 5, ...)

Arguments

object

an object of class '"ldPower"', a result of a call to ldPower.

x

an object of class '"summary.ldPower"', a result of a call to summary.ldPower.

digit

the number of significant digits to use when printing.

...

further arguments passed to or from other methods.

Value

The function 'summary.ldPower' returns a list of summary values of the group sequential boundary calculations given in 'object'.

Author(s)

T. Charles Casper [e-mail] and Oscar A. Perez

References

Reboussin, D. M., DeMets, D. L., Kim, K. M., and Lan, K. K. G. (2000) Computations for group sequential boundaries using the Lan-DeMets spending function method. Controlled Clinical Trials, 21:190-207.

Fortran program 'ld98' by the same authors as above.

DeMets, D. L. and Lan, K. K. G. (1995) Recent Advances in Clinical Trial Design and Analysis, Thall, P. F. (ed.). Boston: Kluwer Academic Publishers.

Lan, K. K. G. and DeMets, D. L. (1983) Discrete sequential boundaries for clinical trials. Biometrika, 70:659-63.

See Also

ldBounds for computation of boundaries using alpha spending function method. ldPower for exit probabilities given boundaries OR drift (effect) given power OR confidence interval OR adjusted p-value.

Examples

## See function 'ldPower'