Table 2.

Stroke algorithm performance.

Model	ICD-9a	Clinical concept	CPTb	Classifier	Precision	Recall	F score
1	Yes	Symptoms + disease concepts	Yes	Random forest	0.912	0.906	0.905
2	Yes	Symptoms + disease concepts	Yes	Logistic	0.807	0.795	0.793
3	Yes	Symptoms + disease concepts	No	Random forest	0.835	0.845	0.836
4	Yes	Symptoms + disease concepts	No	Logistic	0.791	0.777	0.772
5	Yes	Disease-only concept	Yes	Random forest	0.920	0.915	0.915
6	Yes	Disease-only concept	Yes	Logistic	0.809	0.798	0.796
7	Yes	Disease-only concept	No	Random forest	0.856	0.847	0.846
8	Yes	Disease-only concept	No	Logistic	0.779	0.767	0.763

^aICD-9: International Classification of Diseases, Ninth Revision.

^bCPT: Current Procedural Terminology.