Lilliefors Test
Lilliefors (LF) test is a modification of the Kolmogorov –Smirnov test. The KS test is appropriate in a situation where the rameters of the hypothesized distribution are completely known. However sometime it is difficult to initially or completely specify the parameters as the distribution is unknown. In this case, the parameters need to be estimated based on the sample data. When the original KS statistic is used in such situation, the result can be misleading whereby the probability of type ǀ error tend to be smaller than the one given in the standard table of the KStest (Lilliefors, 1967). In contrast with the KS test, the parameters for LF test are estimated based on the sample. Therefore, in this situation, the LF test will be preferred over the KS test (Oztuna, 2006). Given a sample of n obseavation,Lf statistic is defined as (Lilliefors,1967),
Lilliefors TestLilliefors (LF) test is a modification of the Kolmogorov –Smirnov test. The KS test is appropriate in a situation where the rameters of the hypothesized distribution are completely known. However sometime it is difficult to initially or completely specify the parameters as the distribution is unknown. In this case, the parameters need to be estimated based on the sample data. When the original KS statistic is used in such situation, the result can be misleading whereby the probability of type ǀ error tend to be smaller than the one given in the standard table of the KStest (Lilliefors, 1967). In contrast with the KS test, the parameters for LF test are estimated based on the sample. Therefore, in this situation, the LF test will be preferred over the KS test (Oztuna, 2006). Given a sample of n obseavation,Lf statistic is defined as (Lilliefors,1967),
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