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participant. For each vignette, the same set of
questions was asked for each of the following
constructs: perceived physical invasiveness,
perceived usefulness, perceived ease of use, and
intention to use. All items were measured by a
five point scale (1 = strongly agree, 5 = strongly
disagree).
The survey was administered to faculty, staff,
and students at the University of Mississippi.
A total of 298 usable responses were collected.
Table 3 shows the demographic information for
the sample used.
To analyze the model, a series of linear regres-
sions were performed to obtain path coefficients
for the proposed model. Situational differences in
the usage scenarios of the devices were introduced
through the use of vignettes in the instrument.
As described above, the vignettes were varied
by changing the device type, usage context, and
application area as well as the length of time as-
sociated with using the device. To test the impact
of varying the situational characteristics on the
model, dummy variables were introduced in some
of the regressions. In this manner, we were able
to observe if any vignette had an undue influence
while the number of vignettes introduced to each
subject and the variation of their contexts allowed
for an overall view of the impact of the additional
constructs. The regression equations (1 thru 3) for
these tests are shown below.
Where PI = perceived invasiveness, P =
perceived need for privacy, S = perceived need
for security, PEU = perceived ease of use, PU
= perceived usefulness, and D
1
through D
7
are
dummy variables associated with the vignette
scenarios (where Di
i
= 1 if vignette i is used, Di
i
= 0 otherwise).
The proposed relationship between perceived
need for privacy and perceived need for security
was found to be significant in prior research (Pirim
Table 3. Profile of survey participants
Total Number of Participants
298
Sex
Male
144
Female
154
Age
17-21
98
22-36
97
Over 36
103
Major
CS
6
Engineering
16
Finance
31
Management
23
MIS
13
Marketing
47
Other
162
Highest Level of Education
High School
78
2-Year Associates
51
4-Year Undergraduate
67
Masters
42
Ph.D.
60
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