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The equation for brand choice probabilities incorporates such factors as perceived utility and loyalty , along with brand width measures . The government wants the records preserved for possible use in criminal investigations . The first would tell phone companies to destroy customer records as soon as the records are no longer are needed for legitimate business purposes . Happersett 's set of beautifully printed , accordion-folded artbooks , Box of Growth , features grid spaces that are filled in with a specific number of strokes per row , where the number is determined by the Fibonacci sequence . When calibrated using data from purchase records and shopping trips , the equations can be used to identify which product substitutions would lead to higher profits and to quantify lost sales from poor category management . Another equation provides purchase probabilities . Paul A.M. Dirac ( 1902-1984 ) made many important contributions to theoretical physics . Pretexting is the practice of impersonating a phone customer to gain access to his phone records . Indeed , some sequences of notes result from little more than a slowly changing phase relationship between oscillations governing air pressure and those controlling labial stiffness .