41. Instead it is best described by a " power law , " a sort of elongated ski slope. 42. While the pattern of urban hierarchy tends to conform to the power law , it is not universal. 43. It was not successfully identi�ed until Weibull in 1939 recognized that the tail is a power law . 44. The dashed lines are power law fits. 45. Toward this end, the CDC and associations of state officials prepared a draft model health powers law . 46. Power law of the top Wikipedian editors, which is similar to the article creation and bot curves47. This allows a smooth ( though exponential, rather than power law ) decay of the system history. 48. The modified power law equation then becomes: 49. These often follow a power law . 50. It is primarily in the study of statistical distributions that the name " power law " is used.