An open-source tool to identify active travel from hip-worn accelerometer, GPS and GIS data

Table 4 The confusion-matrix and accuracy scores per mode, expressed as percentages, compared with the STAMP-2 study

		Observed mode					Mode	Positive predictive value^a	Sensitivity^b	F1 score^c
		Cycle	Walk	Train	Vehicle	Stationary	Mode	Positive predictive value^a	Sensitivity^b	F1 score^c
Predicted mode	Cycle	1381	290	0	109	182	Cycle	70.4	67.9	69.1
	Walk	17	7729	0	1	202	Walk	97.2	73.6	83.8
	Train	1	39	716	0	320	Train	66.5	89.8	76.5
	Vehicle	602	329	0	14,242	2840	Vehicle	79.1	98.1	87.5
	Stationary	33	2112	81	171	179,539	Stationary	98.7	98.1	98.4

^aPositive predictive value (PPV) or Precision, the ratio of true positives to the sum of true and false positives
^bSensitivity or Recall/ True positive rate/Detection rate, the ratio of true positive to true positives and false negatives
^cF1 score, the harmonic mean of PPV and sensitivity

ISSN: 1479-5868