Tag Archives: longitudinal survey

NCES EDAT as as Data Source

Just a quick note:  some of the data which wanted and could not get the ICPSR, such as the Educational Longitudinal Study of 2002, is available at http://nces.ed.gov/edat/ — I will continue to look for data sources other than the better known but clearly … Continue reading

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WLS SAS Catalog or Command Files and Bit Arrays

Using a text editor it was easy to convert the SAS catalog files which come with the WLS to simpler formats to be read by simple programs.

Creating a bit array with the Python Bitarray package will produce a one dimensional array of bits, any number of which can be put in a list to produce a two dimensional thing. I need them transposed. You can transpose an ordinary two dimensional list of lists in one line of code using map and zip. Continue reading

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Row Coordinates, Comparing Microvariables

Coordinates for individual persons can be constructed by finding extreme points and using the similarity to these extremes as coordinates.

Given these coordinates, the same number of coordinates for the microvariable representing one value of a survey variable can be creating by taking the mean of the rows which have that bit set. Continue reading

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Finding Compatibility Data in WLS

I am still looking for better sources of the information most important to me, but I have had some luck with the Wisconsin Longitudinal Study.   Just a bit, but some.   On question, repeated on different instruments asks how close the respondent … Continue reading

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