fit_dist_pois: Fit Offspring Distribution to the Poisson Distribution

In ABCp2: Approximate Bayesian Computational Model for Estimating P2

Description

This function fits offspring data to the Poisson distribution, and tests the goodness of fit using the chi-squared test.

Usage

fit_dist_pois(dist)

Arguments

dist	a numeric vector of data values for number of offspring per dam.

Value

estimate	Lambda parameter estimated from the supplied distribution.
sd	Standard deviation of the lambda estimate.
vcov	Variance/covariance matrix of the lambda estimate.
loglik	the log-likelihood of the lambda estimate.
n	The number of observations.
statistic	The chi-squared test statistic.
parameter	Degrees of freedom for the chi-squared test.
p.value	P-value for the chi-squared test.
data_pois	Vector of values generated from the Poisson distribution.

Author(s)

M. Catherine Duryea, Andrew D. Kern, Robert M. Cox, and Ryan Calsbeek

Examples

#Fit the Lambda parameter to a distribution of offspring.
#Test the goodness of fit.

data(fungus)
fungus_fit<-fit_dist_pois(fungus$Total_Offspring)
fungus_fit$fit_pois
fungus_fit$chi_pois
hist(fungus_fit$data_pois)

Example output

Loading required package: MASS
Warning message:
In chisq.test(dist, data_pois) : Chi-squared approximation may be incorrect
    lambda  
  14.333333 
 ( 1.092906)

	Pearson's Chi-squared test

data:  dist and data_pois
X-squared = 59, df = 54, p-value = 0.2978

ABCp2 documentation built on May 1, 2019, 6:31 p.m.