Using K-means to find the optimal nodal center for Radial Basis Function

Introduction In my previous article on “Introduction to the perceptron algorithm”  we had seen how a single layer perceptron model can be used to classify an OR gate. But when the same model was used to classify a XOR gate it failed miserably. The problem was with linearity, i.e. if the classes are not linearly separable “Single layer perceptron model”…

Understanding Softmax Regression with an example in R

Introduction to Softmax Regression We have commonly used many classification algorithms for binary classification. Now we will see a classification technique which is used to classify k classes. This technique is called softmax regression. Softmax regression is also called as multinomial logistic regression and it is a generalization of logistic regression. Softmax regression is used to model categorical dependent variables…

Regression

Locally Weighted Regression (LWL)

Locally Weighted Regression (LWL) or LOWESS The basic assumption for a linear regression is that the data must be linearly distributed. But what if the data is not linearly distributed. Can we still apply the idea of regression? And the answer is ‘yes’… we can apply regression and it is called as locally weighted regression. We can apply LOESS or…

Conjoint Analysis

Conjoint Analysis : From an HR analytics perspective

Introduction Conjoint analysis is a popular technique in the area of marketing. It gives valuable information about the voice of the consumer. We are often faced with situations in which we have to take decisions (purchase of goods, selection of a tourism package etc.) and we are required to evaluate multiple criteria while we arrive at the final decision. In almost…

Time Series Forecasting

“Correlogram Analysis” Finding the order of Mean model in Time Series Analysis

Introduction to Corellogram Analysis To all those who know how to model a Time Series data using ARIMA ,you must have come across the term “Correlogram Analysis“,and to all those who don’t know what it is let me start with a basic definition. In the analysis of data, a correlogram is an image of correlation statistics. In time series analysis, a correlogram, also known as an autocorrelation…

Plotting maps in R using ggmap

Introduction The objective is to explore ‘ggmap’ package in R and use this package to plot points on the map. Also, you can view other posts related to visualizations here. For this post, I’ll be using the map of India. Initially, I’ll try to explain some of the basic functions in ggmap and then I’ll explain by plotting different airports…