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When conducting survival analysis employing Cox model, it is necessary to check the underlying assumptions.
Unfortunately, according to Altman's review of survival analyses in cancer journals, only 5percentt of all studies using the Cox model check the underlying assumptions [ 23].
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Since checking the underlying assumptions of all methods is not easy, and even if the assumptions are met, each method may provide different results, which are hard to interpret.
The primary focus of the statistical analysis will be the comparison of the two treatment groups, and this will be reflected in the analysis which will be reported together with appropriate diagnostic plots that check the underlying model assumptions.
The primary focus will be the comparison of the two treatment groups of patients, and this will be reflected in the analysis which will be reported together with appropriate diagnostic plots that check the underlying model assumptions.
Kurtosis measures and skew tests were performed to check and confirm the underlying assumptions of ANOVA in analysing the data.
Employees at all levels are supposed to get basic information about their pension plans once a year, but it is difficult, if not impossible, to check the validity of the underlying assumptions.
However, in implementing these statistical methods, engineers very seldom check the validity of the underlying assumptions with respect to the available data and this may lead to serious problems.
The underlying assumptions of normality of residuals for analysis of variance model were checked by using skewness and kurtosis statistics.
The underlying assumptions of normality and equal variance of the errors for a linear regression model were checked and validated with no evidence to the contrary.
It all depends on the underlying assumptions.
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CEO of Professional Science Editing for Scientists @ prosciediting.com