GrowthData3 {FSA} | R Documentation |
Hypothetical growth data for testing
Description
Hypothetical lengths at time of marking/tagging and recapture and time-at-large (i.e., between marking and recapture). These data are useful for testing growth related functions (e.g., findGrowthStarts
) as they were generated from known growth functions (e.g., von Bertalanffy) with some random error and are, thus, “as good as it gets” for testing.
Format
A data frame of 128 observations on the following 5 variables:
- tag
A unique fish ID (i.e., tag) number
- tlM
Total length at time of marking/tagging simulated from a von Bertalanffy growth function with Linf=450, K=0.3, and t0=-0.5
- tlR
Total length at time of recapture simulated from a von Bertalanffy growth function with Linf=450, gi=0.3, and ti=3 and assuming a random time-at-large from marking/tagging of roughly 1, 2, or 3 years.
- deltat
Time-at-large (i.e., time between marking/tagging and recapture) simulate to be 1, 2, or 3 years (with decreasing probability) and some random error of a few days.
- deltaL
Change in length between the time or marking/tagging and recapture (i.e.,
tlR
-tlM
).
Topic(s)
Growth
von Bertalanffy
See Also
GrowthData1
, GrowthData2
, and findGrowthStarts
Examples
str(GrowthData3)
head(GrowthData3)
plot(tlR~tlM,data=GrowthData3)
abline(a=0,b=1,col="red")