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Data from the 1993 ‘Survey of training and education’ show that 52 percent of males and 60 percent of females had at some time used a computer. An analysis using earnings functions reveals that computer usage is associated with a wage premium of between 12 and 16 percent. Experiments show that omissions of a variable recording computer usage from a wage equation will result in a bias of between 10 and 15 percent in the estimated return to a year of schooling and a similar distortion to the estimated return to experience.