 Louis Goldman, professor at Wichita State University, states that an increase of .404 points was reported from a survey in 134 colleges from 1965 to 1973.A second study in 180 colleges, showed a .432 GPA increase from 1960 to 1974, both indicating grade inflation.Stuart Rojstaczer, a retired geophysics professor at Duke University, has collected historical data from over 400 four-year schools, in some cases dating back to the 1920s, showing evidence of nationwide grade inflation over time, and regular differences between classes of schools and departments.