Schleusener, Richard A., authorMarwitz, John D., authorCox, William L., authorColorado State University, publisher2019-09-172019-09-171964-04https://hdl.handle.net/10217/198030CER64RAS-JDM-WLC13.April 1964.Includes bibliographical references.Prepared for submission to Journal of Applied Meteorology.Hailfall data collected from a fixed network in northeastern Colorado during three seasons (1960-62) included the estimated impact energy, duration of hailfall, most common stone size, maximum stone size, and number of stones per square inch. These basic data, X, along with the transformations; ln X, √X, ∛X and 1/X were analyzed by computer methods to determine which parameters could be used in a statistical analysis of hail suppression experiment. The gamma distribution function was fitted to the hailfall data by the method of maximum likelihood. A chi-square goodness of fit test was applied to the data, and one transformation was tested using a sequential analysis technique. All parameters except impact energy and number of hailstones per square inch were eliminated from the statistical analysis because of bias, non-homogeneity, or sparsity of samples. Transformations which produced the minimum mean coefficient of variations were logarithm of impact energy (ln E) and square root of the number of stones per square inch (√(N_(1-6) ) ). It was determined that a target control analysis was not feasible for the analysis of hail suppression experiment. A period of 3 to 5 years is believed to be necessary to detect changes of 10 to 25 percent in the hail parameters. The gamma distribution function fitted only the (√(N_(1-6) ) ) data. From the results it was conclude that a sequential analysis test alone could not adequately evaluate the effectiveness of a hail modification experiment.technical reportsengCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.Hail -- ColoradoHail control -- ColoradoText