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Data Information

The final ECLS-B restricted-use data file was released in December, 2009. It contains data from all rounds of the ECLS-B as well as some supplemental data (e.g., from the joint book-reading mini-study).

Confidentiality. Due to NCES's confidentiality legislation, ECLS-B case-level data are available only to qualified researchers who are granted a restricted-use data license. When presenting analyses, preparing manuscripts, publishing ECLS-B results, or sending email correspondence (including to NCES staff), analysts must comply with ECLS-B rounding rules. Unweighted sample sizes must be rounded to the nearest 50. For example, a cell size of 25 to 74 is rounded to 50, 75 to 124 is rounded to 100, and a cell size less than 25 is denoted by a symbol indicating "rounds to zero." Further, all presentations and manuscripts prepared using ECLS-B restricted-use data must be sent to the NCES Data Security Office (IESData.Security@ed.gov) for disclosure review prior to publication or presentation, as is required by the terms of the NCES restricted-use data license.

Data Analysis System (DAS). A subset of variables from the ECLS-B 9-month data collection is available to the general public in the Data Analysis System (DAS) http://nces.ed.gov/das/. DAS is an on-line tool that allows users to build tables of weighted estimates, calculate t-tests, and produce correlation matrices for use in linear regression analyses. The DAS webpage has links to an on-line tutorial and user guide to help users navigate through the application and produce desired tables.DAS users are strongly encouraged to review the description screen for the variables they are interested in examining because this screen has important information about the variables, including: an explanation of the variable, the questionnaire item to which the variable pertains, the respondents who were asked the question, the variable’s range of values, and weighted frequencies for each value. For composite variables, this screen also contains detailed information about how the variable was created. DAS users are also strongly encouraged to use the DAS in conjunction with the ECLS-B questionnaires, which can be accessed here: http://nces.ed.gov/ecls/birthinstruments.asp. Variables appear in the DAS in questionnaire order (after the composite variables), by questionnaire section. Reviewing the questionnaires will help users better understand the flow of the interview, the groups of respondents who answered specific questions, and the context in which specific questions were asked. This is particularly important as some of the skip patterns are complex. The label for each variable begins with the questionnaire item number, which makes it easy for users to locate the question to which each variable pertains.

Periodicity

Birth: Information regarding prenatal care and delivery was obtained from the National Center for Health Statistics and the 9-month parent interview.

9 months of age: In this first round of data collection, the ECLS-B directly assessed children and interviewed primary caregivers (usually the mother) in the children's homes. Resident and nonresident fathers completed a self-administered questionnaire. The in-home visit included a videotaping of parent-child interaction.

2 years of age: The ECLS-B directly assessed children and interviewed primary caregivers in the children's homes. Resident and nonresident fathers completed a self-administered questionnaire. The in-home visit included a videotaping of parent-child interaction. Early care and education providers were interviewed by telephone and a subsample of the children had their nonparental care and education arrangements directly observed.

4 years of age/preschool: The ECLS-B directly assessed children and interviewed primary caregivers in the children's homes. Resident fathers completed a self-administered questionnaire. The in-home visit included a videotaping of parent-child interaction. Early care and education providers were interviewed by telephone and a subsample of the children had their nonparental care and education arrangements directly observed.

Kindergarten: Information about the children’s experiences at kindergarten entry was collected in two school years, 2006-07 and 2007-08. The second collection was necessary because children born later in 2001 were not age-eligible for kindergarten in 2006-07 and some children experienced a delayed kindergarten entry (i.e., they did not enter kindergarten when they were age-eligible to do so). Data were collected for all sample children in the fall of 2006 (the kindergarten 2006 collection), when approximately 75 percent of them were in kindergarten or higher. In the fall of 2007 (the kindergarten 2007 collection), data were collected for the 25 percent of sample children who had not entered kindergarten the year before, for children who were repeating kindergarten in the 2007-08 school year, and for twins of children in these groups.

In both kindergarten collections, the ECLS-B assessed children and interviewed their primary caregivers in the children's homes. In the kindergarten 2006 collection, the early care and education providers of children who had not yet entered kindergarten were interviewed by telephone. The before- and after-school care and education providers of children who were enrolled in kindergarten also were interviewed by telephone. Before- and after-school care and education providers of the children participating in the kindergarten 2007 collection were interviewed by telephone as well. In both collections, teachers of children enrolled in school completed a self-administered questionnaire. School data were drawn from existing universe data files supported by NCES (i.e., the Common Core of Data and the Private School Survey).

Data Format

ECLS-B restricted-use data are provided to license holders on a password-protected DVD. The DVD includes raw data files, Electronic Codebook (ECB) software that allows users to create customized data files, user manuals, sampling reports, the survey instruments, and the data file record layout. The ECB can be used to 1) examine variables in a dataset, 2) examine question wording, response categories and frequency distributions, and 3) select and export variables along with the appropriate code needed to create SAS, SPSS-PC and STATA datasets. For instructions on how to access the ECLS-B files on the restricted-use DVD, see "How to Install and Access Data on the ECLS-B DVD."

ECLS-B data available through the DAS are structured in a similar fashion as data available on the restricted-use files. The DAS software application allows users to conduct statistical analyses on-line, without directly accessing the data file.

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