@gabrielrufino/samplesize NPM

Package to determine the correct sample size for a survey

What is Sample Size?

Every survey needs an ideal number of responses according to the survey's target audience. This is where a statistical calculation that determines the desired sample size comes in.

The calculation is based on three important variables: population size, confiability rate and margin of error.

N: The population size
z: Score calculated from the confiability rate
e: Margin of error
p: Constant, generally 0.5

More information here.

Getting started

Install the package:

npm install @gabrielrufino/samplesize

Calculate the sample size:

import SampleSize from '@gabrielrufino/samplesize'

const size = SampleSize.calculate({
  population: 3000,
  confidence: SampleSize.confidences['90%'],
  errorMargin: 0.05,
})

console.log(size) // 250