Dear David
I think you misunderstood me, I need to find the name for an r package that models the population size from time 0 for a group of animals. I provided details to make it clearer the type of model I want to run. The only population model I have come across thus far is Popbio, which appears to be for plants? Therefore, can you assist me by telling me the name for a package that is used to model exponential growth: Exponential growth model is -- ?The exponential growth model assumes that the population starts out at time t=0 at some initial N(0), and growth at constant exponential rate r. If r>0 this results in theoretically unlimited growth over time. The fundamental equation of growth is ? ?N(t+1)= N(t) exp(r) I do not have a known growth rate figure for my species, therefore, I plan to use life history data obtained from wild populations (of one particular species) to model the current population size for a group of animals introduced onto an island. Thank you for your help in this matter Josephine ________________________________ From: David Winsemius <[email protected]> Sent: 27 August 2016 03:32:55 To: Msindai, Nadejda Cc: [email protected] Subject: Re: [R] Exponential population model > On Aug 26, 2016, at 5:49 AM, Msindai, Nadejda <[email protected]> wrote: > > Dear admin > > I am writing to ask for help with writing an R script to model the current > population size using life history data (I do not know the intrinsic rate of > increase (r)). > > My study population are a group of introduced chimpanzees, that were released > by the Frankfurt Zoological Society in 1966-1969 onto an island in Lake > Victoria. > > Thus I want to run a density independent population model using life history > data, with 0 net migration/immigration (so this is a closed system). > > > These are the individuals entering the system (in my case arriving on the > island), after 1969 no new animals arrive. > > Year 1966 1966 1966 1966 1966 1966 1966 1968 1969 > 1966 1966 1966 1966 1968 1969 > Animal ID F1 F2 F3 F4 F5 F6 F7 F8 > F9 M1 M2 M3 M4 M5 M6 > DOB 1955 1955 1956 1957 1958 1959 1955 1960 1960 > 1958 1959 1959 1962 1960 1960 > > Notes: Year is the year animal was released into the population > F=female > M=male > DOB=date of birth > > > Using the following life history data I want to estimate the population size > for the year 1979, 1989, 1999, and 2014, as well as future projection for > 2019, 2029 etc. > > Age at first birth for females: 11 years > Birth interval: 55.2 months > Age at last birth: 50 years (in 40-50 years only 47% of females have > offspring) > Survival to 8 years = 67.7%(Female) 51.4%(Male) > Survival to 15 years 41%(Female) 27%(Male) > Survival 15-40 years 18%(Female) 11%(Male) > Survival 40+ years 7%(M/F) > > > > Birth ratio set as ___M = Male, F = Female (set as 50:50) > This looks like a homework question and Rhelp is specifically announced as not doing homework. See the Posting Guide. -- David. > > > > I hope you can be of help > > Kind regards > > Josephine > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. David Winsemius Alameda, CA, USA [[alternative HTML version deleted]] ______________________________________________ [email protected] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
