README.md

In issactoast/r4issactoast: Favorite R Functions for <www.issactoast.com>

r4issactoast

The goal of r4issactoast is to provide users of this package with various functions used in the posts from issactoast.com, so that users can easily reload the functions without copying and paste.

Installation

You can install r4issactoast from github with:

# install.packages("devtools")
devtools::install_github("issactoast/r4issactoast")

List of functions

Here is the list of functions in the packages and related blogpost numbers. You can visit the post by adding the post number after the "www.issactoast.com". For example: www.issactoast.com/100

library(r4issactoast)

mom_gamma()

• Related posts: www.issactoast.com/95~97

Calculate the method of moment estimator of gamma distribution parameters for given sample.

my_sample <- rgamma(50, shape = 2, scale = 3)
mom_gamma(my_sample)
#>     k_hat theta_hat 
#>  1.870048  3.015523

mle_gamma()

• Related posts: www.issactoast.com/95~97

Calculate the maximum likelihood estimator of gamma distribution parameters for given sample.

my_sample <- rgamma(50, shape = 2, scale = 3)
mle_gamma(my_sample)
#>     k_hat theta_hat 
#>  2.955463  1.761099

newton_method()

• Related posts: Optimization with R: 1. Newton's method

Finding root of the function f using f and its derivative.

x_cu <- function(x){x^3}
x_sq <- function(x){3*x^2}
newton_method(f = x_cu, df = x_sq, x_0 = 3)
#> Final value of function: 9.9616e-17
#> [1] 4.63564e-06

issactoast/r4issactoast documentation built on May 19, 2019, 8:22 a.m.