This parameter is probably not very useful, as it can be negative

tlag_bluck_coward(cf)

## Arguments

cf named vector of coefficients; only k and beta are required. Note that in this package, k is measured in 1/min (e.g. 0.01/min), while in the literature is is often quoted as 1/h (e.g. 0.6/h).

## Value

Lag phase in minutes (time t at which the maximum in the rate of change of g(t) occurs)

exp_beta, and t50_bluck_coward for an example.