Simple linear regression xlstat how to#
Simple linear regression xlstat code#

Simple linear regression xlstat code#

Using R we can come with the following code to compute the RMSEР”В®rror <- model$residuals # same as data$Y - predictedY To compute the RMSE we take the square root and we get the RMSE If we do this for each data point and sum the error we will have the sum of the errors, and if we takes the mean we will get the Mean Squared Error (MSE)Р”Р„ common way to measure error in machine learning is to use the Root Mean Squared Error (RMSE)Р’В so we will use it instead. Note that the expression is the error, if we make a perfect prediction will be equal to and the error will be zero. We can compare each value with the associated predicted value and see how far away they are with a simple difference. In order to measure how good our model is we will computeР’В how muchР’В errors it makes. The only difference with the previous graph is that the dots are not connected with each other.

Points(data$X, predictedY, col = 'blue', pch=4)Р”Р‡or each data point the model makes a prediction displayed as a blue cross on the graph. To do that we will change a little bit our code to visualize each prediction made by our model In order to be able to compare the linear regression with the support vector regression we first need a way to measure how good it is. The code above displays the following graph: We can now use R to display the data and fit a line:Р”ВataDirectory <- 'D:/' # put your own folder hereР”Вata <- read.csv(paste(dataDirectory, 'regression.csv', sep=''), header = TRUE) Here is the same data in CSV format, I saved it in a file regression.csvР’В :

I prefer that over using an existing well-known data-set because the purpose of the article is not about the data, but more about the models we will use.Р”Р„s you can see there seems to be some kind of relation between our two variables X and Y, and it look like we could fit a line which would pass near each point. To begin with we will use this simple data set: We will first do a simple linear regression, then move to the Support Vector Regression so that you can see how the two behave with the same data.

Simple linear regression xlstat how to#

In this article I will show how to use R to perform a Support Vector Regression.