Laserfiche WebLink
<br />variation for the mean of 20 samples. <br />Considerable overestimation bias is exhibited <br />by the gamma distribution. This bias can be <br />serious because overestimation can lead to a <br />des ign that is too large or an est imate of <br />the probability of failure of existing <br />structures that is too large. Obviously, <br />factors besides empiricdl fit need to be <br />considered in selecting a distribution to fit <br />a data set. <br /> <br />Table l. Ninety-ninth percentile averages. <br />Data Set True Ganuna Weibull <br />Value Estimate Estimate <br />All 20 runs 38.70 42.24 39.71 <br />3 runs with 38.70 42.58 40.04 <br />Gamma best <br />by SS <br />8 runs with 38.70 42.81 40.27 <br />Ganuna best <br />by K <br /> <br />4 <br />