Change in EPP Reports
Prior to September 2011, domain scores were reported as scaled scores. But ETS recommended, and TEA and stakeholders agreed, that these domain scaled scores were easily misinterpreted. So, as of September 2011, domain percent-correct scores are being reported to EPPs instead of domain scaled scores.
To compare current domain percent-correct scores to earlier domain scaled scores, you would have to calculate the domain percent-correct scores for any test taken prior to September 2011. For each domain, you can do this by dividing the number of correct answers by the total number of questions. For example, suppose that one of your candidates took a test in September 2010 and then took the same test again in September 2011. To compare the candidate's performance within individual domains, you would have to access the candidate's 2010 score report, calculate the percent correct for each domain and compare it to the respective percent correct from the 2011 roster. Similarly, each candidates' percent correct for any domain can be compared to the average percent correct that appears in summary reports.
Although domain percent-correct scores across different versions of the same test title are not directly comparable as a result of variations in difficulty among different versions of the test title, these variations are generally small enough to permit reasonable comparisons for diagnostic purposes. Total-test scaled scores, however, are directly comparable across all versions of the same test title.