dart_statistics 0.0.2

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A dart library for statistics

Usage #

A simple usage example:

import 'package:dart_statistics/dart_statistics.dart';


void main() {
// We expect a fair die
  final expected = <double>[2, 2, 2, 2, 2, 2];

// Looks pretty unfair...
  final observed = <double>[6, 3, 3, 0, 0, 0];

// Reduction in degrees of freedom is 1, since knowing 5 categories determines the 6th
  final reduction = 1;

  var probability = chiSquaredTest(
    observed,
    expected,
    degreesOfFreedomReduction: reduction,
  ).probability;
  print(probability);
  assert(probability == 0.010362);
// Gives 0.010362, which indicates that it's unlikely the die is fair

// However, something a little more likely
  observed.clear();
  observed.addAll([1, 2, 4, 4, 2, 1]);
  probability = chiSquaredTest(
    observed,
    expected,
    degreesOfFreedomReduction: reduction,
  ).probability;
  print(probability);
  assert(probability == 0.414881);
// Gives back 0.415881, which is indicates that they did come from the same distribution (by most statistical standards)
}

Features and bugs #

Please file feature requests and bugs on github, I will gladly accept pull requests and changes, this is not a library that I'm actively developing. If anyone would like to take over the library that is also fine.

0.0.1 #

0.0.2 #

  • Changed optional parameter of degrees of freedom reduction to be 1, since a lot of applications will require the frequencies / probabilities to sum to one. And a reduction of 0 would cause an exception anyways

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:


dependencies:
  dart_statistics: ^0.0.2

2. Install it

You can install packages from the command line:

with pub:


$ pub get

with Flutter:


$ flutter pub get

Alternatively, your editor might support pub get or flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:


import 'package:dart_statistics/dart_statistics.dart';
  
Popularity:
Describes how popular the package is relative to other packages. [more]
45
Health:
Code health derived from static analysis. [more]
100
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
90
Overall:
Weighted score of the above. [more]
70
Learn more about scoring.

We analyzed this package on Mar 30, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.1
  • pana: 0.13.6

Health suggestions

Format lib/src/chi_squared_test.dart.

Run dartfmt to format lib/src/chi_squared_test.dart.

Maintenance suggestions

Package is pre-v0.1 release. (-10 points)

While nothing is inherently wrong with versions of 0.0.*, it might mean that the author is still experimenting with the general direction of the API.

Maintain an example.

None of the files in the package's example/ directory matches known example patterns.

Common filename patterns include main.dart, example.dart, and dart_statistics.dart. Packages with multiple examples should provide example/README.md.

For more information see the pub package layout conventions.

Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.7.0 <3.0.0
Dev dependencies
pedantic ^1.8.0
test ^1.6.0