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Life-span development of adaptive behavior of 30,749 mentally retarded individuals residing in California and being served by the California Department of Developmental Services was studied. The estimated life-span trends differed somewhat from those reported in an earlier investigation (Eyman & Arndt, 1982.) We used a larger sample and a more appropriate model and found different growth curves in adaptive behavior over levels of retardation, contrary to the Eyman and Arndt findings. Moreover, when cross-sectional vs. semi-longitudinal growth curves were compared, the degree of similarity of the two types of curves was a function of level of retardation. Evidence on the need for large sample life-span studies based on at least 6 to 8 years follow-up was presented.
R K Eyman, and
K F Widaman
January 1982,
American journal of mental deficiency,
R K Eyman, and
K F Widaman
March 1983,
American journal of mental deficiency,
R K Eyman, and
K F Widaman
June 1986,
Journal of mental deficiency research,
R K Eyman, and
K F Widaman
November 1961,
American journal of mental deficiency,
R K Eyman, and
K F Widaman
April 1989,
Psychological reports,
R K Eyman, and
K F Widaman
February 1978,
Mental retardation,
R K Eyman, and
K F Widaman
November 1973,
American journal of mental deficiency,
R K Eyman, and
K F Widaman
January 1983,
Applied research in mental retardation,
R K Eyman, and
K F Widaman
September 1979,
American journal of mental deficiency,
R K Eyman, and
K F Widaman
January 1986,
American journal of mental deficiency,
