Using Predictive Algorithms to Track Real Time Health Trends

blog.algorithmia.com

I am confused. Isn't there supposed to be some test set result which verify the performance of the model?

Things like Mean Absolute Error, Root Mean Absolute Error, Relative Absolute Error, Coefficient of Determination etc.

Generally yes, but it's not really important in this case. All they're doing here is using it to smooth a graph for display