Analysis of variance technique was first introduced by R. A. Fisher. Though the name ANOVA suggests splitting of total variance into different components, actually it splits total sum of squares obtained from a dataset on a certain response variable into different sum of squares according to various sources of variations. …

In previous article of this series we learned how to calculate values of coefficients, test of slope coefficients and Hypothesis.

You must have heard about Regression models many times but you might have not heard about the techniques of solving or making a regression model step-wise.

When the input data is unlabeled and we have to find hidden patterns or clusters in the data set unsupervised learning comes in the picture. In clustering what we do is given a data set we look for similarities among the data points and make clusters accordingly. The clusters are …

So far we know that when the constants of a population (the parameters) are unknown, we estimate them by finding estimates based on the samples drawn from the same population. This method is called “estimation”. Now, since we are estimating the parameters so there must be two types of …

Is there any basis why probability distribution has to be talked about? What are its uses in understanding data? Can it show a sense of relevance according to one’s needs? These are some of the questions that one has to ask in studying probability statistics. Taking into consideration all of …

Dispersion Dispersion means the variability, spread in the data. Average gives a single representative of the data however reliability of average is more if dispersion is less. Consider the following example, suppose there are three screw manufacturing machines each of them is supposed to produce screw with length 3 …

Hypothesis Testing The primary objective of any statistical analysis is to gather information about some characteristics of the population. But usually only a part of the population (i.e. sample) can be accessed and hence one needs to make guess about the characteristics of the population from the knowledge obtained from the sample. …

Regression analysis is a method to find functional relationships among variables. The relationship is expressed in the form of an equation or a model depicting connection between the response or dependent variable and one or more explanatory or predictor variables. Regression analysis includes the following steps: Statement of the problem– …

ONE-WAY CLASSIFICATION ________________________________________________________________________________________________ Definition : Analysis of variance (ANOVA) uses F-tests to statistically assess the equality of means when you have three or more groups. When we come across a problem when we need to compare more than two means then we perform Analysis of variance (ANOVA). Assumptions for ANOVA …