The use of Excel as an interface makes XLSTAT a user-friendly and highly efficient statistical and multivariate data analysis package. XLSTAT is a modular statistical software built around XLSTAT-Pro - the core product of Addinsoft. XLSTAT is a complete analysis and statistics add-in for MS Excel that has been developed since 1993. It includes regression (linear, logistic, nonlinear), multivariate data analysis, parametric tests, non parametric tests, ANOVA, ANCOVA, forecasting. We then obtain the size N such that the test has a power as close as possible to the desired power.XLSTAT is a complete data analysis and statistics add-in for MS Excel. This algorithm is adapted to the case where the derivatives of the function are not known. It is called the Van Wijngaarden-Dekker-Brent algorithm (Brent, 1973). To calculate the number of observations required, XLSTAT uses an algorithm that searches for the root of a function. Calculating sample size for logistic regression taking statistical power into account These approximations depend on the normal distribution.
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