The
Test Set Average and Individual RMSE
tab contains the following elements:
Learning curves are constructed by using a succession of different sized subsets of the full data and assessing
cross validation
performance on each.
Sample size
is plotted on the
x
-axis while the cross validation performance metric is plotted on the
y
-axis. The primary goal of this process is to determine whether adding more samples will change performance. This is achieved by inspecting the slope of the curves, especially toward the right-hand side. If the curves have a slope similar to that show in this example, it is likely that adding more samples will improve performance. If the slopes are flat, adding more samples will likely not make much of a difference.
The plots
above
show the
RMSE
for each model across the range of training set size. The plotted root mean square error (RMSE) represents the average of the RMSE for each of the validation runs. The smaller the RMSE is, the better the model is at predicting the response. Refer to
RMSE
for more information about this statistic.