Description Usage Arguments Value References Examples
FitVBGM
using Ricker 1975, eqn. 9.9 to calculate
length at age.l_t = L_{inf}(1 - e^{-K(t-t_0)})
1 |
data |
Dataframe with length and age fields. |
len |
Numeric length field within data. |
age |
Numeric age field within data. |
start |
Starting parameters passed to |
... |
Further arguments passed to |
Model fit object of type nls
.
Ricker, W.E. (1975). Computation and Interpretation of Biological Statistics of Fish Populations. Bulletin of the Fisheries Research Board of Canada, Bulletin 191, Ottawa.
1 2 3 4 5 6 7 8 9 10 11 12 13 | # start_vals from Cal Fish and Game, Kohlhorst et al 1980
start_vals <- list(Linf = 261.2, K = 0.04027, t0 = 3.638)
# catch_data <- subset(trammel_catch, !is.na(Age))
# below example giving error...need to troubleshoot
## Not run:
FitVBGM(
data = subset(trammel_catch, !is.na(Age)),
len = FL,
age = Age,
start = start_vals
)
## End(Not run)
|
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.