Begin Time Use this text box to specify the study day or week at which to begin the analysis. Note: You must specify the scale using the Time Scale drop-down menu. To Specify the Time to Begin the Analysis: Enter the numeric value corresponding to the desired day or week in the text box. For example, to begin the analysis at day 5 of the study: Make sure that Days is selected as the Time Scale. Type 5 in the text box, as shown below: