MAINTAINING ENGAGEMENT IN LONG-TERM INTERVENTIONS WITH RELATIONAL AGENTS

Figures & data

FIGURE 1 Virtual laboratory exercise counselor agent.

FIGURE 2 Plots of measures over time by study group for variability study. Left plot: Repetitiveness. Middle plot: Desire to continue. Right plot: Sessions.

TABLE 1 Descriptive Statistics for Key Weeks in Variability Study

	Before switch			After switch
	Overall	First week	Final week	Overall	First week	Final week
	3.84 (1.27)	2.55 (1.65)	4.14 (1.08)	3.84 (1.05)	3.97 (1.27)	3.73 (1.16)
Nonvariable	3.95 (1.40)	2.37 (1.44)	4.00 (1.36)	3.55 (1.41)	3.52(1.53)	3.80 (1.34)
Desire to continue variable	4.87 (0.49)	4.84 (0.52)	4.75 (0.44)	4.63 (0.59)	4.57 (0.50)	4.64 (0.49)
Nonvariable	4.57 (0.82)	4.66 (0.65)	4.40 (0.97)	4.49 (0.80)	4.47 (0.83)	4.50 (0.72)
Sessions per week variable	5.14 (1.94)	4.86 (2.73)	3.57 (1.27)	3.73 (2.00)	4.43 (2.37)	4.70 (1.83)
Nonvariable	4.75 (2.02)	6.18 (1.78)	4.90 (1.85)	4.20 (2.15)	3.29 (2.50)	3.82 (2.56)
Steps variable	6139 (3444)	6119 (4014)	5303 (3612)	4154 (3357)	5451 (3999)	3936 (3750)
Nonvariable	6651 (3964)	7065 (4464)	6687 (3447)	5558 (3550)	6327 (3267)	4883 (4042)

TABLE 2 Longitudinal Model Fit and Hypothesis Tests for the Variability Study

		Steps	Desire to continue	Perceived repetitiveness	System usage
Random effects	Intercept	2214.93 ***	0.305	0.882 ***	0.932 ***
	Day	11.22 ***	0.972	0.003 ***	0.008 ***
Fixed effects	Intercept	6758.19 *** (593.51)	2.940 *** (0.428)	3.642 *** (0.221)	1.792 *** (0.249)
	Day	−13.63*** (3.58)	0.069 (0.245)	0.001 (0.001)	−0.010*** (0.002)
	Condition	847.97 * (401.28)	−2.003*** (0.494)	0.387 *** (0.081)	−0.320*** (0.131)
	Day ×condition	−8.12* (3.60)	0.020 *** (0.006)	–	–

FIGURE 3 Effects of study day and variability condition on system usage.

FIGURE 4 Example narrative dialogue showing the same story fragments in first-person and third-person conditions.

TABLE 3 Descriptive Statistics for Key Weeks in Back Story Study

	Overall	First week	Final week
Look forward
First-person	4.16 (1.15)	4.42 (0.83)	3.96 (1.33)
Third-person	4.30 (1.01)	4.48 (0.97)	4.04 (1.15)
Enjoy stories
First-person	2.92 (1.56)	3.65 (1.35)	2.86 (1.72)
Third-person	2.55 (1.32)	2.60 (1.36)	1.98 (1.21)
Dishonest
First-person	1.76 (1.07)	1.77 (1.24)	1.66 (0.99)
Third-person	2.13 (1.26)	2.06 (1.32)	2.25 (1.29)
Sessions per week
First-person	5.13 (2.18)	5.77 (1.74)	5.77 (1.69)
Third-person	4.32 (2.15)	5.62 (1.71)	4.54 (1.76)
Steps
First-person	5298 (2938)	5395 (3322)	5276 (2590)
Third-person	6952 (3760)	6611 (3510)	6665 (4326)

TABLE 4 Longitudinal Model Fit and Hypothesis Tests for Back Story Study

		Steps	Look forward	Enjoy stories	Dishonest	System usage
Random effects	Intercept	1836.56 ***	0.676 ***	1.127 ***	0.794 ***	1.477 ***
	Day	60.50	0.031 ***	0.038 ***	0.034 ***	0.012 ***
	Intercept	5200.58 *** (554.25)	4.410 *** (0.198)	3.384 *** (0.326)	1.688 *** (0.236)	3.207 *** (0.478)
Fixed effects	Day	7.46 (17.48)	−0.017* (0.007)	−0.035*** (0.009)	0.272 (0.326)	−0.046*** (0.010)
	Condition	1550.91 * (728.08)	0.145 (0.281)	−1.059* (0.461)	0.002 (0.008)	−1.148* (0.560)

FIGURE 5 Effects of study day and story condition on system usage.