jtouyz / stats.js

A collection of stats functions, probability distributions and tests for javascript

A collection of stats modules

Some fun with stats modules in javascript

Math calcs

1. sum
2. prod
3. min
4. max
5. quantile

Statistics

1. Measures of central tendency
2. Mean
3. Median
4. Mode
5. Measures of dispersion
6. Central Moments
7. Variance
8. p-Moment

Probability Distributions

1. Uniform

• Random numbers

2. Beta
3. Binomial
4. Cauchy
5. Chi-Square
6. Exponential
7. F
8. Gamma
9. Geometric
10. Hypergeometric
11. Logistic
12. Log Normal
13. Negatvie Binomial
14. Normal
15. Poisson
16. Student t
17. Studentized Range
18. Uniform
19. Weibull
20. Wilcoxon Rank Sum statistic
21. Wilcoxon Signed Rank Statistic
22. Multivariate normal

Unit tests

Notes on performance choices:

• Expressions preferred over Expressions
  • Avoids hosting problems
  • Can be used un functional paradigms
• Optimization of methods based on the tests:
  • https://jsperf.com/loops/106
• Performance between sets and for loops are comparable in the absence of 'delete' operation for appending arrays
• Pre-allocate vs non-preallocate array
  • Small array's, pre-allocate:
    • https://jsperf.com/array-preallocation-performance/11
  • Large array's pre-allocate <10000,
  • https://jsperf.com/preallocating-array/9
  • https://jsperf.com/preallocating-array/15
• Max/min operations executed using 'reduce' function since doesn't suffer from stack overflow issues