Mark Trede, "The Age-Profile of Mobility Measures: An Application to Earnings in West Germany", Journal of Applied Econometrics, Vol. 13, No. 4, 1998, pp. 397-409. The data used in the article are from the German Socio-Economic Panel data set. The public use file of the micro data is provided free of charge to researchers. However, use of the data is subject to special regulations. Data privacy laws necessitate the signing of a data transfer contract with the DIW. More information can be found at URL: http://www.diw-berlin.de/soep/soepe.htm The GAUSS programs and procedures used in the article are zipped in the file tre-prgs.zip. The documentation (10 pages) is available both as a LaTeX file (doc-tex.zip) and as a PostScript file (doc-ps.zip). All files are in DOS format. Please address any questions to: Mark Trede Seminar fuer Wirtschafts- und Sozialstatistik Universitaet zu Koeln Albertus-Magnus-Platz 50923 Koeln Germany email: trede@wiso.uni-koeln.de