The video uses an ellipse to explain principal components because it provides an intuitive geometric model for the data cloud. The main axes of the ellipse are identified as the directions PCA wants to find, which are called principal components.
Conditions: The data are approximated by an ellipse.; The ellipse is described verbally as 'basically a two-dimensional Gaussian.'
The video uses an ellipse to explain principal components because it provides an intuitive geometric model for the data cloud. The main axes of the ellipse are identified as the directions PCA wants to find, which are called principal components.
Conditions: The data are approximated by an ellipse.; The ellipse is described verbally as 'basically a two-dimensional Gaussian.'