Skip to main content
. Author manuscript; available in PMC: 2018 Mar 29.
Published in final edited form as: Proc Am Stat Assoc. 2012;2012:4648–4660.
Landline Model Cell Model
Hazard Ratio Std. Error Hazard Ratio Std. Error
Novembera 0.968 0.005 *** 1.006 0.005
Ever answering machineb 0.536 0.003 *** 0.204 0.001 ***
Ever refusedb 0.815 0.006 *** 0.254 0.003 ***
Ever hung upb 0.834 0.006 *** 0.484 0.004 ***
Ever called 1–800 numberb 3.425 0.067 *** 2.701 0.037 ***
1 day lagc 0.162 0.003 *** 0.029 0.000 ***
2 day lagc 0.097 0.002 *** 0.018 0.000 ***
3 day lagc 0.080 0.002 *** 0.013 0.000 ***
4 day lagc 0.048 0.001 *** 0.008 0.000 ***
5–6 day lagc 0.025 0.001 *** 0.005 0.000 ***
7–10 day lagc 0.027 0.001 *** 0.003 0.000 ***
11 or more day lagc 0.005 0.000 *** 0.001 0.000 ***
M-Th morningd 1.194 0.014 *** 1.163 0.014 ***
M-Th afternoond 0.875 0.006 *** 0.967 0.008 ***
M-Th nightd 1.083 0.007 *** 0.880 0.007 ***
Fri morningd 1.290 0.030 *** 1.514 0.033 ***
Fri afternoond 0.701 0.010 *** 0.903 0.012 ***
Fri eveningd 1.359 0.017 *** 1.060 0.012 ***
Fri nightd 1.398 0.017 *** 0.971 0.013 *
Sat morningd 1.306 0.017 *** 1.467 0.027 ***
Sat afternoond 1.266 0.014 *** 1.117 0.016 ***
Sat eveningd 0.813 0.016 *** 0.812 0.019 ***
Sat nightd 0.708 0.015 *** 0.676 0.016 ***
Sun morningd 1.370 0.025 *** 1.127 0.024 ***
Sun afternoond 0.817 0.009 *** 0.675 0.010 ***
Sun eveningd 1.162 0.015 *** 0.860 0.016 ***
Sun nightd 0.936 0.012 *** 0.699 0.012 ***
a

Month of data collection, with reference category of March.

b

Indicates the sample line ever had this outcome over all calls, with reference category of No.

c

Day of lag time since previous call, with reference category of zero days.

d

Day and time of call, with reference category of weekday (Monday through Thursday) evening.

*

p < 0.05

**

p < 0.01

***

p < 0.001