Business Analytics with R
The core focus of Business Analytics is to develop new insights to business and to assess performance. There has been enough spoken about Business Analytics and its various techniques. What is required the most is a thorough understanding of how statistics is applied in Business Analytics.
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What is Statistical Modeling?
Statistical Modeling is the formalization of relationships between variables in the form of mathematical equations. It is basically about finding out the variable. It describes how one or more variables are related to one or more other variables. Here, the variables are not accurately related but could be stochastically related.
In simpler terms, a variable is nothing but an attribute. An attribute becomes a person’s height, weight and age. Height and age are probabilistic in nature. A 30-year old person has higher chances of being 4 ft tall. Similarly, when you are aware of a person who is 13 years of age, he has higher chances of being 6 ft tall.
The whole purpose of statistical modeling is not about the research, it ultimately comes down to providing an insight to solutions. It involves analyzing the data and applying it in different circumstances. The topics discussed in the video are as follows:
1. What is Statistical modeling
2. What is Regression Modeling
3. Understanding Analytics
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What is Regression Modeling?
As mentioned in the above lines about statistical modeling, an important and basic factor in this theory is Regression Modeling. Regression modeling is all about sourcing the relationship between two variables. More specifically, regression helps one understand how the value of the dependent variable changes while any one of the independent variable varies, while the other independent variables are held fixed. For instance, time is an independent variable while sales and velocity are dependent on certain factors. Hence, the goal is to find out the relationship between the two.
There are certain equations in the regression model, it being the linear, multivariate and logistic regression. Logistic regression is similar to regression wherein there are two variables, therefore classifying itself as a probabilistic statistical model. It is used in describing the parameters of a qualitative response model.
In the diagram mentioned in the video, the line introduces two concepts-one which is on the line and the other which is not. The ones away from the line have an error. This is the distance between the actual value (blue dots) and the predicted value (the black line). The goal of modelling, be it in any form is to minimize these errors, which is to try and bridge the gap between the two. There are other techniques to understand the theory.
Understanding Analytics in Business
The entire operation of analytics boils down to 3 simple models- Predictive, descriptive and decision model. As the name suggests, it enables one to comprehend the future. For instance, system failure, credit worthiness, fraud come under the predictive model which is gaining world wide popularity today. On the other hand, there is descriptive and decision models that have existed for a long time. A descriptive model enables one to characterize the data, wherein, a country’s GDP and average life expectancy rate can be estimated. It is also exploratory in nature, where a customer provides the data and the problem is analyzed. The customer is given an insight to the problem and then the decision model is used after which certain optimizations are proposed. The model has a target which is nothing but optimization.
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