Comparison of All Waves of Survey Data
Overview  |  Search  | Technical Note
Wave 1 Data Tables | Wave 2 Data Tables | Wave 3 Data Tables | Wave 4 Data Tables

Overview.  The Study of State and Local Implementation and Impact of the Individuals with Disabilities Education Act, SLIIDEA, was designed as a national assessment to examine how the changes in the 1997 IDEA amendments are affecting states, districts, and schools, as well as infants, toddlers, children and youth with disabilities and their families. The Comparison of All Waves of Survey Data tables represent the responses from states, districts, and schools to the State, District, and School Questionnaires collected during the 1999-2000, 2002-2003, 2003-2004 (state only), and 2004-2005 school years. The data reflect a census of states and a nationally representative sample of districts and schools.  

The data presented here compare data from all waves of data collection in which a particular question was asked and deemed comparable to the relevant question asked in other waves. Most comparisons are between Wave 2 and Wave 4 data, because changes were made to the survey questionnaires after Wave 1. Each state table presents the percentage and number of states providing each response, and the percentage point change over time. In each district and school table, the findings are reported by the percent of districts or schools, along with the standard error. The "difference" column represents the percentage point change over time; statistical significance of the change is noted where applicable. The "source note" at the bottom of each table indicates the relevant survey item(s).

The discussion of the findings from these tables appear in the final reports from the study, The SLIIDEA Sourcebook Report and Marking the Progress of IDEA Implementation (April 2006).

Search.  There are two ways to access the data tables: (1) Select one of the three levels of data -- state, school district, or school -- and see categories and subcategories of data tables under each level; or (2) Select a keyword and see state, school district, and school tables that are associated with the keyword.

Search by Category.  Indicate which level of data you are interested in: State, School District, or School.

• State
• School District
• School

Search by Keyword.  Select from the following list of key words to see State, School District, and School tables associated with each keyword:

Technical Note. Except for conditional findings, each survey item adds to 100 percent. When conditional questions were asked on the survey, we report these findings as conditional of those state, districts, or schools that indicated "yes" as the response to the survey item. The denominator for the conditional items was the number of states, districts or schools that reported "yes," and not of all states, districts, or schools that responded to a particular item. Here is an example of how a conditional response has been reported: Thirty-nine percent of states reported that they rewarded districts or schools on the basis of student performance. Of these states, 11 percent considered the performance of students with IEPs when making this determination. (See Wave 2 State Exhibit 1.9.) In this example, 39 percent represents the number of states that reported yes, they reward districts or schools for student performance, divided by the number of states that responded to the question on rewards. Eleven percent represents a subset of the 39 percent of states, and is thus, a conditional percentage of 39 percent. On the other hand, if one wanted to know the unconditional percentage - that is, how many states considered the performance of students with IEPs when determining a reward to districts and schools - one would multiple 11 percent by 39 percent by 100 to equal 4 percent (.11x .39 = .04 x 100 = 4 percent). 

And finally, in each exhibit, we present the "Missing N" and "Total N." We used the following criteria for determining each of these numbers: 

• Missing N: The number of states, districts, or schools that had a missing or invalid response for the survey item. 
• Total N: The number of states, districts, or schools providing a valid response to the item.