[R] Details about the boxcox function

[Rui Barradas]

Às 18:22 de 23/01/2025, Daniel Lobo escreveu:
> Hi,
> 
> I tried with
> 
> library(MASS)
> methods('boxcox')
> # [1] boxcox.default* boxcox.formula* boxcox.lm*
> 
> Then
> 
>> boxcox.lm
> 
> Error: object 'boxcox.lm' not found
> 
> How to look into the codes of boxcox.lm?
> 
> Thanks for your time
> 
> 	[[alternative HTML version deleted]]
> 
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Hello,

In such cases, try ?getAnywhere.


library(MASS)

getAnywhere("boxcox.lm")
#> A single object matching 'boxcox.lm' was found
#> It was found in the following places
#>   registered S3 method for boxcox from namespace MASS
#>   namespace:MASS
#> with value
#>
#> function (object, lambda = seq(-2, 2, 1/10), plotit = TRUE, interp = 
(plotit &&
#>     (m < 100)), eps = 1/50, xlab = expression(lambda), ylab = 
"log-Likelihood",
#>     ...)
#> {
#>     m <- length(lambda)
#>     if (is.null(object$y) || is.null(object$qr))
#>         object <- update(object, y = TRUE, qr = TRUE, ...)
#>     result <- NextMethod()
#>     if (plotit)
#>         invisible(result)
#>     else result
#> }
#> <bytecode: 0x00000220c9e6f9d0>
#> <environment: namespace:MASS>


?NextMethod tells you to look in the default method.



boxcox.default
#> Error: object 'boxcox.default' not found

getAnywhere("boxcox.default")



Hope this helps,

Rui Barradas


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