## How many clusters are generated by the K Means algorithm?

We’ll use this data because it’s easy to plot and visually spot the clusters since its a 2-dimension dataset. It’s obvious that we have 2 clusters. Let’s standardize the data first and run the kmeans algorithm on the standardized data with K=2.

## What is the difference between hierarchical and k means clustering?

K- means clustering a simply a division of the set of data objects into non- overlapping subsets (clusters) such that each data object is in exactly one subset). A hierarchical clustering is a set of nested clusters that are arranged as a tree.

## What are the benefits of hierarchical clustering?

The advantage of hierarchical clustering is that it is easy to understand and implement. The dendrogram output of the algorithm can be used to understand the big picture as well as the groups in your data.

## How do you identify data clusters?

Here are five ways to identify segments.

1. Cross-Tab. Cross-tabbing is the process of examining more than one variable in the same table or chart (“crossing” them).
2. Cluster Analysis.
3. Factor Analysis.
4. Latent Class Analysis (LCA)
5. Multidimensional Scaling (MDS)

## What are the strengths and weaknesses of hierarchical clustering?

The weaknesses are that it rarely provides the best solution, it involves lots of arbitrary decisions, it does not work with missing data, it works poorly with mixed data types, it does not work well on very large data sets, and its main output, the dendrogram, is commonly misinterpreted.

## What is clustering in machine learning?

Clustering is a Machine Learning technique that involves the grouping of data points. Given a set of data points, we can use a clustering algorithm to classify each data point into a specific group.

## Why Clustering is called unsupervised learning?

Machine Learning “Clustering” is the process of grouping similar entities together. The goal of this unsupervised machine learning technique is to find similarities in the data point and group similar data points together.

## What are the two types of hierarchical clustering?

Hierarchical clustering can be divided into two main types: agglomerative and divisive.

• Agglomerative clustering: It’s also known as AGNES (Agglomerative Nesting). It works in a bottom-up manner.
• Divisive hierarchical clustering: It’s also known as DIANA (Divise Analysis) and it works in a top-down manner.

## What are the 2 major components of Dbscan clustering?

DBSCAN requires two parameters: ε (eps) and the minimum number of points required to form a dense region (minPts). It starts with an arbitrary starting point that has not been visited. This point’s ε-neighborhood is retrieved, and if it contains sufficiently many points, a cluster is started.

## Which clustering algorithm is called bottom up approach?

Agglomerative approach: This method is also called a bottom-up approach shown in Figure 6.7. In this method, each node represents a single cluster at the beginning; eventually, nodes start merging based on their similarities and all nodes belong to the same cluster.

## Which of the following is a clustering algorithm?

K-means clustering algorithm K-means clustering is the most commonly used clustering algorithm. It’s a centroid-based algorithm and the simplest unsupervised learning algorithm.

## What is clustering explain with an example?

Clustering is the task of dividing the population or data points into a number of groups such that data points in the same groups are more similar to other data points in the same group than those in other groups. In simple words, the aim is to segregate groups with similar traits and assign them into clusters.

## How do you explain hierarchical clustering?

Hierarchical clustering, also known as hierarchical cluster analysis, is an algorithm that groups similar objects into groups called clusters. The endpoint is a set of clusters, where each cluster is distinct from each other cluster, and the objects within each cluster are broadly similar to each other.

## What are the applications of hierarchical clustering?

Hierarchical clustering is a powerful technique that allows you to build tree structures from data similarities. You can now see how different sub-clusters relate to each other, and how far apart data points are.

## Is Dbscan hierarchical clustering?

HDBSCAN is a clustering algorithm developed by Campello, Moulavi, and Sander. It extends DBSCAN by converting it into a hierarchical clustering algorithm, and then using a technique to extract a flat clustering based in the stability of clusters.

## Is Dbscan supervised or unsupervised?

DBSCAN (Density-Based Spatial Clustering of Applications with Noise) is a popular unsupervised learning method utilized in model building and machine learning algorithms.

## What are the requirements of clustering algorithm?

The main requirements that a clustering algorithm should satisfy are:

• scalability;
• dealing with different types of attributes;
• discovering clusters with arbitrary shape;
• minimal requirements for domain knowledge to determine input parameters;
• ability to deal with noise and outliers;

## What is K in K means algorithm?

k-means is one of the simplest unsupervised learning algorithms that solve the well known clustering problem. The procedure follows a simple and easy way to classify a given data set through a certain number of clusters (assume k clusters) fixed apriori. The main idea is to define k centers, one for each cluster.