Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to create the random sample by defining the probabilities for each unit in R?
The random sample can be created by using sample function, this random sample gives equal chance for each unit to be selected in the sample, hence it is called simple random sample. If we want to have a sample where each unit has different chance of being selected in the sample then we need to use the argument prob as shown in the below examples.
Example1
x1<−sample(c(1,2,3,4,5),150,replace=TRUE,prob=c(0.1,0.2,0.2,0.2,0.3)) x1
Output
[1] 3 5 1 5 5 2 4 3 5 2 4 1 4 2 3 4 4 5 2 5 1 1 5 5 3 5 4 2 1 1 5 3 5 4 2 5 2 [38] 5 4 2 3 4 5 3 5 1 4 5 2 4 1 4 5 3 3 5 5 4 5 3 5 4 5 4 3 4 5 3 2 3 3 4 3 2 [75] 3 4 5 4 2 5 2 4 4 4 4 5 3 4 5 5 2 4 2 2 2 4 4 2 5 3 2 5 1 2 3 5 1 3 1 2 3 [112] 3 2 4 5 4 1 3 5 4 4 3 5 1 1 5 2 2 2 4 3 4 4 5 4 5 5 5 5 3 2 3 5 5 5 2 4 3 [149] 5 5
Example
table(x1)
Output
x1 1 2 3 4 5 14 27 28 36 45
Example2
x2<−sample(1:5,150,replace=TRUE,prob=c(0.1,0.2,0.2,0.2,0.3)) x2
Output
[1] 5 2 5 2 3 4 3 4 5 3 3 2 5 2 5 4 4 3 5 2 1 5 5 5 2 5 2 5 5 5 2 4 3 4 4 4 3 [38] 2 5 5 5 2 2 4 4 5 2 2 3 5 5 5 4 3 4 5 5 3 3 3 3 2 3 2 4 5 3 3 2 5 1 5 5 2 [75] 2 3 3 4 3 5 4 5 5 5 4 4 5 4 3 3 3 2 2 4 5 3 5 5 5 5 2 2 5 3 3 5 2 3 4 5 4 [112] 4 5 4 3 2 3 2 4 5 1 2 1 3 5 2 4 4 3 3 4 1 3 1 5 5 5 4 1 1 2 1 5 3 3 1 5 1 [149] 4 5
Example
table(x2)
Output
x2 1 2 3 4 5 11 28 34 29 48
Example3
x3<−sample(0:9,200,replace=TRUE,prob=c(rep(1/10,10))) x3
Output
[1] 4 0 9 3 2 5 7 7 2 0 1 3 4 5 1 0 2 8 4 2 7 2 8 9 4 1 5 6 0 6 0 3 7 8 9 2 7 [38] 3 7 2 0 1 8 3 6 7 2 0 4 3 6 6 7 9 4 3 0 3 6 2 0 1 5 1 5 9 5 4 6 6 2 9 5 5 [75] 4 1 7 9 3 1 6 7 5 0 9 6 8 0 4 0 5 6 0 8 4 3 8 4 2 2 0 8 5 2 9 0 6 8 8 8 6 [112] 2 9 8 8 3 1 5 5 9 8 1 0 9 4 2 2 0 4 0 4 2 8 2 6 9 9 1 5 6 6 3 0 9 9 5 6 2 [149] 0 4 4 8 7 7 4 7 6 4 1 1 2 8 3 1 6 9 2 6 1 1 0 2 3 2 8 6 2 8 5 2 9 9 3 3 9 [186] 4 8 0 1 6 5 8 3 7 0 8 8 7 5 8
Example
table(x3)
Output
x3 0 1 2 3 4 5 6 7 8 9 23 17 25 17 19 18 22 15 24 20
Example4
x4<−sample(0:9,400,replace=TRUE,prob=c(rep(1/10,10))) x4
Output
[1] 5 1 0 5 8 1 6 2 3 7 8 3 2 8 9 7 3 3 0 4 5 9 4 2 3 4 8 8 0 3 4 2 5 0 8 6 7 [38] 2 2 7 8 3 2 1 9 8 3 7 0 4 6 5 4 9 5 3 7 7 1 6 4 7 0 8 7 6 4 2 2 4 8 7 4 5 [75] 7 1 3 1 1 6 6 4 7 5 1 1 5 0 0 1 7 8 6 6 0 6 5 3 2 8 3 3 5 0 2 8 1 4 7 0 6 [112] 7 7 3 6 7 9 7 3 4 8 7 1 9 8 2 5 8 3 3 4 7 0 5 7 2 9 8 4 7 5 0 1 5 9 5 8 2 [149] 0 0 0 2 5 2 0 8 5 0 9 6 8 0 0 2 2 8 1 5 8 3 3 6 5 1 3 5 2 7 5 5 3 7 0 0 5 [186] 9 6 7 4 3 8 1 4 2 3 6 7 9 0 5 6 3 7 7 5 7 8 8 0 2 0 9 7 8 2 4 2 7 3 5 1 1 [223] 2 1 9 2 0 8 8 6 1 1 6 7 4 3 1 1 0 9 4 5 8 1 0 2 6 5 6 8 4 0 8 0 0 6 7 7 4 [260] 2 9 6 2 7 6 2 5 3 0 7 8 3 1 6 7 0 5 5 2 6 8 6 8 2 5 7 7 4 7 3 7 2 1 1 7 4 [297] 3 7 9 9 9 6 5 4 4 2 0 5 1 4 2 7 4 7 5 8 0 7 6 7 1 6 5 3 5 6 4 3 3 2 4 7 5 [334] 1 8 3 1 6 1 8 5 5 0 9 7 6 0 6 2 7 1 2 4 9 8 3 0 7 8 2 9 6 2 3 4 1 1 6 5 6 [371] 1 6 1 0 7 5 1 3 8 6 9 2 2 1 7 2 3 1 5 4 7 2 0 7 9 5 0 8 6 9
Example
table(x4)
Output
x4 0 1 2 3 4 5 6 7 8 9 41 40 43 38 33 45 40 55 41 24
Example5
x5<−sample(1:100,200,replace=TRUE,prob=c(rep(1/100,100))) x5
Output
[1] 55 42 48 27 55 1 69 41 83 20 65 83 55 24 30 52 38 98 [19] 82 9 3 27 58 100 3 90 60 79 71 96 4 42 35 73 31 29 [37] 94 13 92 15 35 1 61 73 14 46 98 69 72 5 41 54 81 9 [55] 74 86 72 88 54 37 55 9 7 3 9 69 100 65 73 85 64 33 [73] 50 76 15 19 13 57 42 9 1 58 78 95 6 43 35 48 8 69 [91] 44 4 82 52 1 37 88 74 50 52 25 27 28 74 83 52 60 87 [109] 84 97 62 15 98 30 92 44 76 33 72 62 98 37 59 40 16 44 [127] 26 67 46 91 23 31 100 80 18 42 51 45 44 85 97 3 87 65 [145] 62 51 36 51 18 55 20 15 53 84 6 61 40 23 24 67 28 55 [163] 86 52 13 28 36 22 50 67 79 33 31 43 86 43 73 26 89 29 [181] 52 36 6 12 40 44 4 65 92 16 33 86 76 21 62 64 94 25 [199] 52 33
Example
table(x5)
Output
x5 1 3 4 5 6 7 8 9 12 13 14 15 16 18 19 20 21 22 23 24 4 4 3 1 3 1 1 5 1 3 1 4 2 2 1 2 1 1 2 2 25 26 27 28 29 30 31 33 35 36 37 38 40 41 42 43 44 45 46 48 2 2 3 3 2 2 3 5 3 3 3 1 3 2 4 3 5 1 2 2 50 51 52 53 54 55 57 58 59 60 61 62 64 65 67 69 71 72 73 74 3 3 7 1 2 6 1 2 1 2 2 4 2 4 3 4 1 3 4 3 76 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 94 95 96 97 3 1 2 1 1 2 3 2 2 4 2 2 1 1 1 3 2 1 1 2 98 100 4 3
Updated on: 10-Feb-2021
91 Views
Advertisements