Estimating simple linear regression
Back to our sales dataset, salesData
, which is already loaded in the workspace. We saw that the sales in the last three months are strongly positively correlated with the sales in this month. Hence we will start off including that as an explanatory variable in a linear regression.
This exercise is part of the course
Machine Learning for Marketing Analytics in R
Exercise instructions
Use the
lm()
function in order to specify a linear regression model usingsalesLast3Mon
as explanatory variable. Assign it to an objectsalesSimpleModel
.Then use the
summary()
function in order to look at the results.Look at the regression coefficient. Is there a positive or negative relationship between the two variables?
About how much of the variation in the sales in this month can be explained by the sales of the previous three months?
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Model specification using lm
salesSimpleModel <- lm(salesThisMon ~ ___,
data = ___)
# Looking at model summary
summary(___)