weib.line: Single Weibull plus line models.
In fzwaeustc/pcrfn: Peng's Collection of R Functions at Nielsen

Description Usage Arguments See Also Examples

weib.line is a weibull function plus a linear adjustment for the first weibull function.

weib.line2 is for the second weibull function.

They differ in some position adjustment.

1 2	weib.line(x, a = 0.14, b = 0.46, beta = 0.02) weib.line2(x, a = 0.14, b = 0.46, beta = 0.02)

`x`	The minutes in STBS sessions, from 1-STBS_duration
`a`	The lambda in a weibull function
`b`	The gamma in a weibull function
`beta`	The slop of the linear part. Notice that the intercept of the linear part is 0.

weibull, double.weibull

#weib.line is defined as
function (x, a = 0.14, b = 0.46, beta = 0.02) 
{
    exp(-a * (x - 1)^b) + beta * (x - 1)
  }
  
#weib.line2 is defined as
function (x, a = 0.14, b = 0.46, beta = 0.02) 
{
    exp(-a * (x + 1)^b) + beta * (x + 1)
  }