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National Center for Special Education Research


Characteristics of States Monitoring and Improvement Practices
NCSER 2008-3008
October 2007

Table E-27.  Number and percentage of states that used stratified random sampling, by categories (strata) used: 2004-05

Categories (strata) Percent of
Number of states All states [N=51] States that used stratified random sampling [n=27]
Child records not reviewed 1 2
Random sampling not used 0 0
Stratified random sampling not used 23 45
Disability category 9 18 33
Age 21 41 78
Date of identification 14 27 52
Race or ethnicity 7 14 26
Setting 4 8 15
Service coordinator1 4 8 15
Language spoken by family1 1 2 4
Town of residence1 1 2 4
Medicaid eligibility1 3 6 11
Other category (strata) used 9 18 33
Not applicable.
1 This category did not appear in the questionnaire. It was constructed from other state specific responses.
NOTE: States could select more than one category, therefore, the Percent columns will not sum to 100.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Special Education Research, Evaluation of States' Monitoring and Improvement Practices Under the Individuals with Disabilities Education Act, Part C Monitoring Evaluation Questionnaire.