probabilityjs

Probability

Installation:

npm install probabilityjs --save

Methods:

• singleChoose

when you are computing probability of selecting set A from set S here you have one type of selection, such as selecting odd numbers in rolling dice. Examples: calculate probability of even numbers in rolling dice

let A = [2, 4, 6]
let S = [1, 2, 3, 4, 5, 6]
let p = probablity.singleChoose(A, S)
console.log(p)
// 0.5

your are rolling dice, 3 times, calculate probability of that result is smaller than 5

let A = [1, 2, 3, 4]
let S = [1, 2, 3, 4, 5, 6]
p  =  probablity.singleChoose(A, S, {
    select:  3 //number of rolling dice
})
 
console.log(p)
//0.2

calculate probability of 1 and 6 in rolling dice

let A = [1, 6]
let S = [1, 2, 3, 4, 5, 6]
p  =  probablity.singleChoose(A, S, {
    decimals: 8 
})
 
console.log(p)
//0.33333333

Methods:

• multiChoose

choosing a items among different type of it, such as choosing 4 red cards from 12 red card and 20 black card

Examples: calculate probability of choosing 1 red card from 26 red and 26 black card

let  A  = [
    {
        name:  'red',
        count:  1
    }
]
  
let  S  = [
    {
        name:  'red',
        count:  26
    },
    {
        name:  'black',
        count:  26
    }
]
let  p  =  probablity.multiChoose(A, S)
console.log(p)
//0.5

Choosing 2 red cards at the same time from 26 red and 26 black card

let  A  = [
    {
        name:  'red',
        count:  1
    }
]
  
let  S  = [
    {
        name:  'red',
        count:  26
    },
    {
        name:  'black',
        count:  26
    }
]
let  p  =  probablity.multiChoose(A, S)
console.log(p)
//0.24509803921568626

choosing 1 red card and then choose 1 red card again from 26 red and 26 black card

let  A  = [
    {
        name:  'red',
        count:  1
    },
    {
        name:  'red',
        count:  1
    }
]
  
let  S  = [
    {
        name:  'red',
        count:  26
    },
    {
        name:  'black',
        count:  26
    }
]
let  p  =  probablity.multiChoose(A, S)
console.log(p)
//0.2549019607843137

choosing 2 black card and then 1 red card from 26 red and 26 black card

let  A  = [
    {
        name:  'black',
        count:  2
    },
    {
        name:  'red',
        count:  1
    }
]
  
let  S  = [
    {
        name:  'red',
        count:  26
    },
    {
        name:  'black',
        count:  26
    }
]
let  p  =  probablity.multiChoose(A, S)
console.log(p)
//0.12745098039215685

choosing 1 blue card from 100 blue card, 5 red card and 6 yellow card

let  A  = [
    {
        name:  'blue',
        count:  1
    }
]
  
let  S  = [
    {
        name:  'blue',
        count:  100
    },
    {
        name:  'red',
        count:  5
    },
    {
        name:  'yellow',
        count:  6
    }
]
let  p  =  probablity.multiChoose(A, S)
console.log(p)
//0.9009009009009009

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