Suhaida Abdullah

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ANOVA is known to be adversely affected by non-normality and unbalanced design. Type I error and power rates are substantially affected when these problems occur simultaneously. Continuously using ANOVA under the influence of these problems eventually will result in unreliable findings. This study proposed a robust procedure known as modified S 1 and F t(More)
The effect of nonnormality and variance heterogeneity on the T 1 statistic is demonstrated. A two-sample trimmed T 1 statistic for equal and unequal population variances and sample sizes are proposed and its performance is also evaluated in comparison to the t-test and Mann-Whitney test. If the underlying distributions are nonnormal with heterogeneous(More)
Ft statistic test is a non classical method of comparing two or more groups. This statistical procedure is able to handle problems of sample locations when non-normality occurs but the homogeneity of variances assumption still applies. This method is not robust under the existence of variance heterogeneity. To make this test less sensitive when either one(More)
GPS has diverse application in current globalized world, its application has pervasive benefits not only to navigation and positioning, it is pivotal in industries like logistics, shipping, financial services and agriculture. Since the decision to shut down the Selectivity Availability (SA) by former U.S. President, Bill Clinton, ionospheric effect is now(More)
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