Change the link — change_link • deltapif

Change the link function for the potential impact fraction or population attributable fraction to a different link.

Usage

change_link(x, link = "identity", link_inv = NULL, link_deriv = NULL)

Arguments

x: A pif_class object
link: Link function such that the pif confidence intervals stays within the expected bounds.
link_inv: (Optional). If link is a function then yhe inverse of link. For example if link is logit this should be inv_logit.
link_deriv: Derivative of the link function. The function tries to build it automatically from link using Deriv::Deriv().

Value

A pif_class object with a different link.

Examples

#A potential impact fraction
pif1 <- pif(p = 0.2, p_cft = 0.1, beta = 1.2, var_p = 0.01,
  var_beta = 0.2)
pif1
#> 
#> ── Potential Impact Fraction: [deltapif-0118194874409683] ──
#> 
#> PIF = 15.848% [95% CI: -19.419% to 40.699%]
#> standard_deviation(pif %) = 15.028

#Now change the pif to logit to control the negatives
pif1_logit <- change_link(pif1, link = "logit")
pif1_logit
#> 
#> ── Potential Impact Fraction: [deltapif-0118194874409683] ──
#> 
#> PIF = 15.848% [95% CI: 2.027% to 63.158%]
#> standard_deviation(pif %) = 15.028