The Litkenhous Difference by Score Ratings system was a mathematical system used to rank football and basketball teams. The Litrating system was developed by Vanderbilt University professor Edward Earl ("E.E.") Litkenhous Jr. (1907 – December 22, 1984) and his brother, Francis H. Litkenhous (December 9, 1912 – June 22, 1996).
Edward Litkenhous (1907-1984) received an undergraduate degree from the University of Louisville and a doctorate from the University of Minnesota. He began his career as a professor of chemical engineering at the Speed Scientific School of the University of Louisville. He later became a professor at Vanderbilt University and served as head of that school's engineering department. He died in 1984.
The National Collegiate Athletic Association (NCAA) football records book includes the Litkenhous Ratings as a "major selector" of college football national championships for the seasons 1934 through 1984.

Teams in the following table were ranked No. 1 by the Litkenhous Difference by Score Ratings system.
The NCAA records book credits Litkenhous as a "major selector" for the seasons 1934 through 1984, and credits the system with 51 total rankings. However no selections are listed in the NCAA records book for six seasons: 1973, 1975, 1976, 1977, 1979, and 1980.
† Years where Litkenhous selection is omitted from the NCAA records book.
The No. 1 team in the year's final ranking was awarded the Litkenhous Ratings Championship trophy. The traveling trophy took the form of a huge wooden plaque and bronze mural by artist Marion Junkin.
The trophy plaque is engraved with the winners for 1934–1962. Ole Miss was evidently the last Litkenhous champion to receive the trophy; the trophy is still held today at the University of Mississippi.
the original computer code for the Litratings was written in COBOL. The code was rewritten in 2004 and by 2016 had become outdated as technology progressed.
The criteria for being included in this historical list of poll selectors is that the poll be national in scope, either through distribution in newspaper, television, radio and/or computer online. The list includes both former selectors, who were instrumental in the sport of college football, and selectors who were among the Bowl Championship Series (BCS) selectors.
The Difference By Score System
The top ratings by years: 1934–1957
Litkenhous Ratings 1966–1934
...presents the national championship Litkenhous trophy to Fritz Crisler, coach of Michigan's 1947 team.
Iowa is the national college football champion in the final 1960 Litkenhous Difference by Score ratings announced today.
1961 National Champions — Trophies — Lithenhous[sic] — National Champions (shown in back)
Texas (1) 117.3
Texas is the Litkenhous national champion as the Longhorns wound up at 124.0.
With the regular season completed, it's Nebraska as expected in the No. 1 slot in the Litkenhous Ratings. — Nebraska 120.6
South'n Cal 119.2
Alabama 123.0, Ohio State 122.8, Notre Dame 116.5
Top-ranked Oklahoma
1. Ohio State 114.3
1. Michigan 115.2
Dr. Litkenhous traditionally determines his system's national champion after the regular season ends. Texas won in 1977.
1. Nebraska 145.8, 2. Penn State 144.0
1. Nebraska 145.8,
This huge plaque, with a bronze mural by Marion Junkin,