Graphing within-subjects confidence intervals using SPSS and S-Plus |
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Authors: | Daniel B. Wright |
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Affiliation: | Psychology Department, University of Sussex, Brighton, England. danw@sussex.ac.uk |
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Abstract: | Within-subjects confidence intervals are often appropriate to report and to display. Loftus and Masson (1994) have reported methods to calculate these, and their use is becoming common. In the present article, procedures for calculating within-subjects confidence intervals in SPSS and S-Plus are presented (an R version is on the accompanying Web site). The procedure in S-Plus allows the user to report the bias corrected and adjusted bootstrap confidence intervals as well as the standard confidence intervals based on traditional methods. The presented code can be easily altered to fit the individual user’s needs. |
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