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The Effect of Probing "Don't Know" Responses on Measurement Quality and Nonresponse in Surveys

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Table 2: Response rates for the eight items considered in the probing study.
Figure 1: Sample distributions of responses to one pseudo-knowledge item (PK3) and oneattitude item (AD5) in the probing study.The horizontal axis of each plot spans theresponse options of the item, and the vertical axis their proportions in the data.Thedistributions are shown separately for the control group (◦) and, in the probing group,for immediate responses for respondents who had not (△; ‘un-probed’) and had (+; ‘pre-probed’) been probed for any previous item, and for probed responses (×).
Table 3: Sample correlations between pairs of items in the probing study, separately forobservations with different combinations of probed and unprobed answers to the items.
Figure 2: Path diagram for the model for multi-item survey responses with probing whichis defined in Section 3
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