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11.
A sample of 1,737 volunteering students, randomly assigned to 12 conditions, rated their current overall (dis)satisfaction
with life. Each condition used 1 of 12 response formats, differing in (1) polarity (bipolar versus unipolar), (2) orientation (horizontal versus vertical), and (3) anchoring (−5 to +5, Not Numbered, and 0 to 10). Results For satisfaction ratings, a negative skew was found for all response formats, but, a higher percentage of respondents scored
in the upper part (Midpoint to top) of the scale with anchor points (−5 to +5) than on the scales with other anchor points
(Not Numbered and 0 to 10). Our results indicate that, satisfaction ratings obtained with either a unipolar or a bipolar response scale were similar, but, participants experienced some difficulty in rating life dissatisfaction using the bipolar dissatisfaction–satisfaction response scale. Moreover, this study has found that life satisfaction and dissatisfaction show
a reciprocal relation, especially when assessed with two independent unipolar rating scales. These results support the inclusion
of one-way unipolar response scales in the assessment of satisfaction and dissatisfaction. Conclusion Our results suggest that the type of response format may influence both satisfaction and dissatisfaction ratings as well
as the relationships between these two constructs.
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Peter TheunsEmail: |
12.
Count data may be described by a Poisson regression model. If random coefficients are involved, maximum likelihood is not feasible and alternative estimation methods have to be employed. For the approach based on quasi-likelihood estimation a characterization of design optimality is derived and optimal designs are determined numerically for an example with random slope parameters. 相似文献