Analyzing Drivers’ Distractions due to Smartphone Usage: Evidence from AutoLog Dataset

Table 1

Measuring Data Reliability using Cronbach Alpha.

Measurement Items	Correlation			Cronbach alpha
	Item-test	Item-rest	Average inter-item
SN1Txt	0.7424	0.7050	0.4235	0.9520
SN2Txt	0.7380	0.7008	0.4237	0.9520
SN3Txt	0.7303	0.7036	0.4235	0.9520
SN4Txt	0.6308	0.5449	0.4314	0.9535
SN5Txt	0.6915	0.6181	0.4278	0.9528
SN6Txt	0.6110	0.5550	0.4309	0.9534
SN7Txt	0.8327	0.7848	0.4196	0.9513
SN8PCall	0.7621	0.7482	0.4214	0.9516
SN9PCall	0.7911	0.7468	0.4214	0.9516
SN10PCall	0.7867	0.7697	0.4203	0.9526
SN11PCall	0.6652	0.6338	0.4270	0.9527
SN1Mail	0.6885	0.6588	0.4258	0.9524
SN2Mail	0.6655	0.6341	0.4270	0.9527
SN3Mail	0.7923	0.7710	0.4203	0.9514
SN4Mail	0.6033	0.5675	0.4304	0.9533
SN5Mail	0.5943	0.5579	0.4309	0.9534
SN6Mail	0.6130	0.5779	0.4299	0.9532
Visual interface-1	0.7235	0.6965	0.4239	0.9521
Visual interface-2	0.6476	0.6149	0.4280	0.9528
Visual interface-3	0.7051	0.6766	0.4249	0.9523
Visual interface-4	0.5465	0.5074	0.4333	0.9538
Visual interface-5	0.5481	0.5091	0.4333	0.9538
Visual interface-6	0.3752	0.3280	0.4425	0.9554
Visual interface-7	0.6682	0.6368	0.4267	0.9526
Recommended Interface-1	0.6295	0.5956	0.4287	0.9530
Recommended Interface-2	0.7643	0.7406	0.4216	0.9516
Recommended Interface-3	0.7153	0.6875	0.4242	0.9521
Recommended Interface-4	0.6273	0.5931	0.4289	0.9530
Observations 98	Test scale		0.4268	0.9542