I am trying to locate recent studies which have validated and used scales for measure behavioral intention. Some papers report one-item measures like, Are you planning to xxx, or I intend to xxx. I am also trying to find studies that have focused on BI to participate in research studies (medical or otherwise).
Does anyone have any suggestions?
Dear Yulia,
this is the website of Ajzen's theory of planned behaviors.
http://people.umass.edu/aizen/tpb.html
There, you will find all resources that you need - most notably a manuscript how to set up questionnaire items.
With regard to the number of item (of any construct): More is always better as you increase the reliability. The problem is that by slightly varying the content/question wording, you may measure different things. For instance, "I intent to do X" is not the same as "I plan to do X" - as planning is something that occurs after the individuals has decided to do X (i.e., the preparation). In the same manner "I will do X" is not intention but "self-prediction" and incorporates feasibility of conducting behavior beyond the mere intention (a reality check). Hence, with every measure, the devil is in the details.
In my career I have conducted thousands of CFAs with so called established mult-indicators scales and almost NONE of them fitted adequately the factor model. Hence, I vote for a very SMALL number but FOCUSED / clear items.
Best,
Holger
Dear Yulia,
this is the website of Ajzen's theory of planned behaviors.
http://people.umass.edu/aizen/tpb.html
There, you will find all resources that you need - most notably a manuscript how to set up questionnaire items.
With regard to the number of item (of any construct): More is always better as you increase the reliability. The problem is that by slightly varying the content/question wording, you may measure different things. For instance, "I intent to do X" is not the same as "I plan to do X" - as planning is something that occurs after the individuals has decided to do X (i.e., the preparation). In the same manner "I will do X" is not intention but "self-prediction" and incorporates feasibility of conducting behavior beyond the mere intention (a reality check). Hence, with every measure, the devil is in the details.
In my career I have conducted thousands of CFAs with so called established mult-indicators scales and almost NONE of them fitted adequately the factor model. Hence, I vote for a very SMALL number but FOCUSED / clear items.
Best,
Holger
Thank you, Holger! I truly appreciate you sharing your insights.
Hi Yulia
A PhD student (Amanda Terry) and I looked specifically at intentions to join a procedure-based registry, which is a bit more restrictive than your question. But we did validate a short 'registry' questionnaire. If you can't find anything more appropriate, you could consider modifying the wording of our scale from 'registry' to 'medical study'. You would at least have some supporting psychometric evidence, although the purists would probably not see any territory between perfect and useless. We also created a a 'concern' questionnaire pertaining to concerns about privacy of health information, thinking there might be a connection between privacy concerns and intent to participate.
Terry AL, Stolee P, Chesworth BM, Bourne RB, Speechley M. Validation of a questionnaire for measuring patient views on their willingness to participate in registries: experience with joint replacement recipients. Journal of Registry Management 2007;34(2):35–9.
The Journal of Registry Management is free online and has the original questionnaire wording: http://www.ncra-usa.org/i4a/pages/index.cfm?pageid=4129
We did a followup paper which was published in Health Policy.
Please let me know how your work turns out,
M. Speechley
A variety of well-known theories and models have been employed to explain the relationship between user beliefs, attitudes, and behavioural intentions. From the stream of social psychology, Innovation diffusion theory (IDT) (Moore and Benbasat, 1996), Theory of Reasoned Action (TRA) (Fishbein and Ajzen, 1975), Theory of Planned Behaviour (TPB) (Ajzen, 1991), the social cognitive theory (Compeau and Higgins, 1995), the motivational model (Davis, Bagozzi and Warshaw, 1992), the model of PC utilization (Thompson, Higgins and Howell, 1991), Technology Acceptance Models (TAM) (Davis, 1989) and a hybrid model combining constructs from TAM and TPB (Taylor and Todd, 1995a), Unified Theory of Acceptance and Use of Technology (UTAUT) (Venkatesh et al., 2003).
You can also have a look at my publications for examples.
please i also want a measuremnt for intentionality if u reach something please help me
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