Tech Notes

My notes on Statistics, Big Data, Cloud Computing, Cyber Security

Tag Archives: sum of squares


Analysis of variance

  • Used to compare differences of means among more than 2 groups.
  • Compares the amount of variation between groups with the amount of variation within groups.
  • Is a method to compare multiple linear models Read more of this post

Linear Regression, Covariance and Correlation

Linear regression is the relation between variables when the regression equation is linear: e.g., y = ax + b

Linear regression – basic assumptions

  • Variance is constant
  • You are summarizing a linear trend
  • You have all the right terms in the model
  • There are no big outliers Read more of this post

Sum of Squares, R Square

The method of least squares is a criterion for fitting a specified model to observed data. For example, it is the most commonly used method of defining a straight line through a set of points on a scatterplot.


The y-hat line above is the line of best fit (predictor line, estimator line)

Read more of this post