Data for the Farewell and Herberg example of a two-phase experiment using a plaid design

The experiment that Farewell and Herzberg (2003) describe is pain-rating experiment that is a subset of the experiment reported by Solomon et al. (1997). It is a two-phase experiment. The first phase is a self-assessment phase in which patients self-assess for pain while moving a painful shoulder joint. The second phase of this experiment is an evaluation phase in which occupational and physical therapy students (the raters) are evaluated for rating patients in a set of videos for pain. The measured response is the difference between a student rating and the patient's rating.<div><br></div><div>The R data file <code>plaid.dat.rda</code> contains the <code>data.frame</code> <code>plaid.dat</code> that has a revised version of the data for the Farewell and Herzberg example downloaded from <a href="https://doi.org/10.17863/CAM.54494">https://doi.org/10.17863/CAM.54494</a>. The comma delimited text file <code>plaid.dat.csv</code> has the same information in this more commonly accepted format, but without the metadata associated with the <code>data.frame<\CODE>.<div><br></div><div>The <code>data.frame</code> contains the factors <code>Raters</code>, <code>Viewings</code>, <code>Trainings</code>, <code>Expressiveness</code>, <code>Patients</code>, <code>Occasions</code>, and <code>Motions</code> and a column for the response variable <code>Y</code>. The two factors <code>Viewings</code> and <code>Occasions</code> are additional to those in the downloaded file and the remaining factors have been converted from integers or characters to factors and renamed to the names given above. The column <code>Y</code> is unchanged from the column in the original file.</div><div><br></div><div>To load the data in <code>R</code> use: </div><div><code><br></code></div><div><code>load("plaid.dat.rda") or </code></div><div><code><code><br></code></code></div><div><code><code>plaid.dat <- read.csv(file = "plaid.dat.csv")</code></code>.</div></code></div><div><code><br></code></div><div><code><b>References</b></code></div><div><code><br></code></div><div><code>Farewell, V. T.,& Herzberg, A. M. (2003). Plaid designs for the evaluation of training for medical practitioners. <i>Journal of Applied Statistics</i>, <b>30</b>(9), 957-965. <a href="https://doi.org/10.1080/0266476032000076092">https://doi.org/10.1080/0266476032000076092</a><br></code></div><div><code><br></code></div><div><code>Solomon, P. E., Prkachin, K. M. & Farewell, V. (1997). Enhancing sensitivity to facial expression of pain. <i>Pain</i>, <b>71</b>(3), 279-284. <a href="https://doi.org/10.1016/S0304-3959(97)03377-0">https://doi.org/10.1016/S0304-3959(97)03377-0</a><br></code></div>