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View Resource Statistical Tools: Expected Death Calculator

This page calculates the expected number of deaths, the expected proportion of deaths at a given time, or the time at which a given proportion of deaths have occurred for a planned study. Users can specify a follow-up period after the close of study accrual and a percentage of patients that have no risk. The program assumes uniform accrual and exponential survival.

http://www.swogstat.org/stat/public/expdeath.htm
View Resource Statistical Tools: Binomial Interaction

This page calculates either estimates of sample size or power for interaction tests. The program allows for unequal sample size allocation in the four cells defined by the two treatment groups and two strata.

http://www.swogstat.org/stat/public/int_binomial.htm
View Resource Statistical Tools: Survival Interaction

This page calculates either estimates of sample size or power for interaction tests. The program allows for unequal sample size allocation in the four cells defined by the two treatment groups and two strata.

http://www.swogstat.org/stat/public/int_survival.htm
View Resource Statistical Tools: Survival Equivalence

This page calculates either estimates of sample size or power for equivalence studies. Exponential distributions are assumed and are specified using the ratio of hazard for treatment 1 to hazard for treatment 2. The ratio of hazard rates describing equivalence is defined in the same way.

http://www.swogstat.org/stat/public/equivsurv.htm
View Resource **Understanding ANOVA visually

Visual ANOVA is a simple little program that puts the theory on ANOVA into a simple visual whole. It assumes that you've read the Even if your understanding is incomplete at this time, it is worth playing with Visual ANOVA since that may clear up the big picture for you.

http://www.psych.utah.edu/stat/introstats/anovaflash.html
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