Technical Manual - Renaissance Learning

Reliability and Measurement PrecisionSTAR Early Literacy Enterprise Equivalence Study DataTable 16:Skill Set Score Split-Half Reliability, Overall and by Grade (Continued)Skill Set ScoreSound-Symbol Correspondence: Consonants 0.84 0.76 0.82 0.84 0.86Sound-Symbol Correspondence: Vowels 0.85 0.74 0.81 0.83 0.84Word Families/Rhyming 0.85 0.74 0.81 0.83 0.84Consonant Blends (PH) 0.85 0.75 0.82 0.84 0.84Consonant Digraphs 0.85 0.75 0.81 0.83 0.84Phonics Sub-Domain (continued)Variant Vowel Sounds 0.85 0.75 0.82 0.84 0.85Other Vowel Sounds 0.85 0.74 0.81 0.83 0.84Structural Analysis Sub-DomainWord Building 0.85 0.74 0.81 0.83 0.83Words with Affixes 0.84 0.75 0.82 0.84 0.86Syllabification 0.84 0.76 0.82 0.85 0.86Compound Words 0.85 0.74 0.81 0.83 0.82Sentence-Level Comprehension Sub-DomainComprehension at the Sentence Level 0.85 0.74 0.81 0.83 0.84Vocabulary Sub-DomainWord Facility 0.85 0.76 0.82 0.84 0.86Synonyms 0.85 0.74 0.81 0.83 0.82Antonyms 0.85 0.74 0.81 0.83 0.83Visual Discrimination Sub-DomainGradesOverall K 1 2 3Letters 0.84 0.79 0.84 0.85 0.87Identification and Word Matching 0.84 0.76 0.82 0.85 0.87In April 2014, as part of the 2014 norming analyses, reliability analyses for STAREarly Literacy Enterprise were also conducted. These reliability analyses, whichwere based on all data from the 2012–2013 school year, computed generic internalconsistency reliability, retest reliability and split half reliability. The split halfreliability was computed by rescoring the randomly sampled test records for theodd and even items using a Rasch model analysis, converting the Rasch ability toScaled Scores and then adjusting the half-length assessments (13 items) to fulllength assessments (27 items) using the Spearman Brown formula. The split halfreliability presented in Table 17 is the correlation between the Scaled Scoresestimated from the odd and even numbered items adjusted to a full assessmentlength of 27 items. This reliability analysis was conducted within and acrossSTAR Early LiteracyTechnical Manual52