Laver won the first open Wimbledon championship that year, and the following year became the only player in singles history to win a second Grand Slam. He is the only player to sweep the majors in a single year in both the amateur and Open eras, an extraordinary achievement that will never be matched.
It is when the operator makes a bad decision, ignores directions, becomes distracted or does something out of character while operating a machine or system and causes a mishap or accident. A car accident caused by the driver is caused by operator error.A more thorough definition for operator error is using it as a concept that explains an accident that occurs when operating a device or system where the error the error that caused it occurred due to the uninfluenced actions of the human operator.t is when the operator makes a bad decision, ignores directions, becomes distracted or does something out of character while operating a machine or system and causes a mishap or accident. A car accident caused by the driver is caused by operator error.
For a given sample, the  error  of the estimator is defined as. where is the parameter being estimated. Note that the error, e, depends not only on the estimator (the estimation formula or procedure), but also on the sample.