Tools to make random choices, generate random numbers, etc. Random Selection is a way to make a choice by computer randomization.

Random Selection - dCode

Tag(s) : Fun/Miscellaneous, Algorithm, Combinatorics

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Tools to make random choices, generate random numbers, etc. Random Selection is a way to make a choice by computer randomization.

Tu use the random choice generator, enter elements to pick and the number of items to select, the program will generate the list of winning items randomly. This generation/randomization is done without bias and uses a pseudo-random generator (or pseudorandomness).

Without list or with too many items, number objects/people and use the random number generator.

Example: The list A,B (2 items) will return on average 50% of the time A (once in 2) and 50% of time B (once in 2).

The list of items can be given in 2 formats: either one item per line, or all item at once but, in this case, items must not contain spaces.

In many countries, it is not longer mandatory to go through a bailiff to file the settlement and result of a game/contest/lotto/tombola/lottery. In order to avoid disputes it is advisable to draft a rule, and to prove the draw, the simplest is to cast it live (easy on Youtube or Facebook).

Without replacement, an item cannot be selected more than once in a draw. It is the case on most random selection processes.

Example: The draw among A,B,C of 2 elements **without** replacement can give A,B, A,C or B,C, but never A,A or B,B. Because there is no replacement of the first drawn element, it can not be drawn a second time.

With replacement, if multiple items have to be selected, then each item is replaced in the item list to select and thus, can appear more than once.

Example: The draw among A,B,C of 2 elements **with** replacement can give A,B, A,B, A,C or 'B, C', but also A,A or B,B or C,C because the first element is returned to the list after the first draw and can be output a second time.

From a lower limit (minimum) and an upper limit (maximum), the software generates a number automatically in the interval.

Example: To make a Youtube/Instagram/Twitter draw among 100 comments/followers, draw a number between 1 and 100.

The program is limited to natural integers. To get a decimal number between 1.5 and 2.5 ask for a number between 15 and 25 and divide by 10 or between 150 and 250 and divide by 100.

The software can generate groups depending on the group size or the total number of groups.

Example: In a set of 6 elements, the program can create groups of size 2 (ie 3 groups of 2) or create a set of 2 groups (ie 2 groups of 3).

dCode can generate a bijection af a group 1 in a group 2. Input all two groups one after the other.

Example: To create random matches in pairs (see also the round-robin championship generator) describe the group 1 A,B,C and the group 2 D,E,F and the program will generate 3 encounters, for example AF,BD,CE

The free software can assign to each person to another (distinct of itself), which is useful for Christmas gifting.

Example: With the group A,B,C,D,E, dCode could propose A->C,C->B,B->E,E->D,D->A

First create groups of similar level (first the seeds, then etc.) of the same size N, then randomly associate to each item of a group a random number (from 1 to N). Each item having the same number is in the same tournament pool.

dCode retains ownership of the source code of the script Random Selection online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, Matlab, etc.) which dCode owns rights will not be given for free. To download the online Random Selection script for offline use on PC, iPhone or Android, ask for price quote on contact page !

- How to make a random sample/selection?
- How to get a proof of the result ?
- What is a random sample without replacement?
- What is a random sample with replacement?
- How to generate a random number?
- How to generate groups of elements?
- How to associate items from two groups of the same size?
- How to assign people for gifting each other's?
- How to create a tournament with seeds?

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Source : https://www.dcode.fr/random-selection

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