Belgium: Extra Lotto

Extra Lotto Cluster Analysis — Grouping Numbers by Behavior

Extra Lotto: k-means clustering: combining numbers with similar draw patterns

Cluster analysis groups Extra Lotto lottery numbers by a combination of characteristics: draw frequency, depth (recency of last draw), and average interval. Instead of analyzing individual metrics, you see the complete picture: "hot stable", "cold", "warming up", and other groups.

Analysis based on 20 draws from to
Clusters:
Warming up
Numbers: 5
Average frequency: 1
Average depth: 4.6
56112135
Cold stable
Numbers: 5
Average frequency: 0
Average depth: 18.8
810374045
Medium
Numbers: 26
Average frequency: 3
Average depth: 2.6
123713141516171819202223242526282930323438394344
Medium
Numbers: 9
Average frequency: 3
Average depth: 9.4
4912273133364142

Cluster Visualization

Frequency vs Depth — color = cluster

Clustering Table

All numbers with their cluster and characteristics
Added to generator 0 / 45
Selected 0
Ball addedBallClusterFrequencyDepth
Add
Warming up22
Add
Warming up18
Add
Warming up10
Add
Warming up17
Add
Warming up16
Add
Cold stable020
Add
Cold stable117
Add
Cold stable117
Add
Cold stable020
Add
Cold stable020
Add
Medium30
Add
Medium34
Add
Medium30
Add
Medium42
Add
Medium32
Add
Medium44
Add
Medium20
Add
Medium45
Add
Medium51
Add
Medium44
Add
Medium32
Add
Medium46
Add
Medium46
Add
Medium35
Add
Medium21
Add
Medium34
Add
Medium33
Add
Medium60
Add
Medium31
Add
Medium31
Add
Medium33
Add
Medium35
Add
Medium40
Add
Medium32
Add
Medium31
Add
Medium45
Add
Medium27
Add
Medium29
Add
Medium313
Add
Medium310
Add
Medium212
Add
Medium26
Add
Medium49
Add
Medium28
Add
Medium311

Generator by Cluster Analysis

Mark numbers from clusters of interest
Selected numbers for generator
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How to Use Cluster Analysis for Extra Lotto

Step-by-step guide to clustering lottery numbers for Extra Lotto lottery
1

Choose the field and number of clusters

For multi-drum lotteries, select the desired field. The number of clusters (3–6) determines grouping detail — start with 4.

2

Study the cluster cards

Each cluster has a name describing the numbers' behavior: "hot stable", "cold stable", "warming up". Pay attention to the average frequency and depth.

3

Analyze the scatter plot

The "Frequency vs Depth" chart shows how numbers are distributed among clusters. Numbers in the top-left are frequent and recent; bottom-right are rare and long absent.

4

Use the generator

Mark numbers from clusters of interest and generate combinations. For example, choose "hot stable" for an aggressive strategy or "warming up" to bet on the trend.

About Cluster Analysis

K-means method and its application

K-means is one of the most popular unsupervised machine learning algorithms. It groups objects (numbers) into K clusters by minimizing the distance to the cluster center.

Frequency

How many times the number has been drawn

Depth

How many draws ago was the last appearance

Interval

Average gap between appearances

Comprehensive approach
Cluster analysis evaluates a number not by a single indicator, but by a combination of characteristics. A number with high frequency but great depth is not the same as a number with high frequency and low depth.

Cluster Analysis Tips

Practical recommendations for effective use of the method
1.
Start with 4 clusters — this is the optimal number for most lotteries. Increase only if you need more detailed grouping.
2.
Pay attention to the "warming up" cluster — these are numbers that have recently started appearing more frequently after a long quiet period.
3.
Combine numbers from different clusters to create a balanced combination.
4.
Clustering results depend on the number of draws. Use the period filter to compare results across different time intervals.

Frequently Asked Questions about Extra Lotto

Answers to common questions about lottery cluster analysis for Extra Lotto

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