Determines the terminal halflife of a sequence of corresponding times and values with optional minimum and maximum times to censor data.
Usage
calculate_halflife(times = NULL, values = NULL, tmin = NULL, tmax = NULL)
Arguments
- times
- sequence of times
- values
- corresponding sequence of values
- tmin
- minimum time to include (NULL)
- tmax
- maximum time to include (NULL)
Value
List with the following names
thalf Halflife in units of times above
mod Result of lm used to fit the log transformed data
df Dataframe with the data and predicted values at the time within tmin and tmax
Examples
x = c(0:100)
y = exp(-.1*x)
th = calculate_halflife(times=x, values=y)
#> Warning: essentially perfect fit: summary may be unreliable
#> Warning: essentially perfect fit: summary may be unreliable
thalf = th$thalf
