## Application of Chi-Square Distribution

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# R Programming

## Principal Coordinate Analysis using R programming

Principal Coordinate Analysis (PCoA) is a method to represent on a 2 or 3 dimensional chart objects described by a square matrix containing resemblance indices between these objects. This method is due to Gower (1966). It is sometimes…

## Heirarchical Clustering Techniques using R

The idea behind hierarchical cluster analysis is to show which of a (potentially large) set of samples are most similar to one another and to group these similar samples in the same the limb of a tree. We have already learned k-means…

What is the Twitter Search API? The Twitter search API, one of three such APIs (search, streaming, “firehose“), allows access to a subset of popular or recent tweets (in the last 4-6 days). That is, it allows querying past tweets (though a…

## Types of Cluster Analysis and Techniques using R

Index Table Definition Types Techniques to form cluster method Definition: It groups the similar data in same group. The goal of this procedure is that the objects in a group are similar to one another and are different from the objects in…

## Hypothesis Testing

The objective of testing statistical significance of  (also ) by stating that we want to test the validity of the null hypothesis (HN), that the true population parameter β=0 against the alternative hypothesis (HA) that is different from…

## Introduction about Logistic Regression Model

Hello guys, we have learnt about Linear Regression model in my previous article. Today, in this article we will get to learn the basics of Logistic Regression and some tricks to find the relation between the variables. Do you know what type…

## Linear Regression Analysis using R

One of the most frequent used techniques in statistics is linear regression where we investigate the potential relationship between a variable of interest (often called the response variable but there are many other names in use) and a set…

## Analysis Of Variance (ANOVA)

So today, I will tell you about ANOVA(ANalysis Of VAriance ). ANOVA: is a parametric method appropriate for comparing the means for 2 or more independent or dependent groups. There are 3 types of ANOVA: (more…)

## Loops and Control Structures in R

In this section we learn about control structures loops used in R. Control structures in R contains conditionals, loop statements like any other programming languages. Loops are very important and forms backbone to any programming…

## R Grouping functions: sapply vs. lapply vs. apply. vs. tapply vs. by vs. aggregate

R Grouping functions have many *apply functions which are ably described in the help files (e.g. ?apply). There are enough of them, though, that beginning users may have difficulty deciding which one is appropriate for their situation or…