The normative data collected at the time of standardization is what distinguishes norm-referenced tests from other assessments. It is through this extensive process that the scores and scales are developed, as well as the norms themselves. The procedures used in the standardization of Logramos Third Edition have been designed to make the norming sample as representative as possible of the Spanish-speaking students in U.S. bilingual/ELL classes during the 2013 and 2014–2015 school years.
A supplemental standardization was conducted in Fall 2014 at Grades K–5 to collect data from a different sample of students in order to provide supportive evidence of, or cross-validate, the results of the Spring 2014 standardization of Logramos Third Edition. Overall, the results of the supplemental research study compare favorably to and are consistent with those of the Spring 2014 standardization.
Proven basic principles and conditions have been adopted to guide the selection of participating schools and students in the standardization and normative update process.
This includes careful selection of the sample to represent the national Spanish-speaking bilingual/ELL student population with respect to ability and achievement.