## Simplest machine learning algorithm – linear regression with excel

Some may say that linear regression is more statistical problem. And this is truth at some level. But when problem is solved from machine learning perspective, things gets easier especially when moving towards more complex problems. First of all lets understand few important terms. We can start with regression. When speaking of linear regression we try to find best fitting line through given points. In other words we need to find optimal linear equation to fit given data points. This is a supervised learning problem when we have set of data pairs that can be plot on x-y axis. I understand, theory is boring thing, even for me, so lets move to practical example and learn by solving some problem. In order to work with some examples we need sample data. There are many data sources available on internet. For instance great source is college cengage that have several sets with data pairs meant for linear regression problems. For our example we are going to use Cricket Chirps Vs. Temperature data where each data point consists of chirps/sec and temperature in degrees Fahrenheit. You can send data in three formats: excel, mtp and ascii. Lets download excel data where we can…