Good Clinical Practice (GCP)
The Good Clinical Practice (GCP) course is designed to prepare research staff in the conduct of clinical trials with human participants. The 12 modules included in the course are based on ICH GCP Principles and the Code of Federal Regulations (CFR) for clinical research trials in the U.S. The course is self-paced and takes approximately six hours to complete.
Researchers are required to complete a quiz following each module, except for the Introduction module. To receive a certificate, all quizzes must be completed with at least 80% accuracy (a 100% passing option is available if required by your IRB). Upon successful completion of all quizzes, the user will be given access to the Certificate of Completion. Within the NIDA Clinical Trials Network, certification expires after three years.
Sample Size Calculator - Clin CalC.com
Determines the minimum number of subjects for adequate study power. This calculator uses a number of different equations to determine the minimum number of subjects that need to be enrolled in a study in order to have sufficient statistical power to detect a treatment effect. Before a study is conducted, investigators need to determine how many subjects should be included. By enrolling too few subjects, a study may not have enough statistical power to detect a difference (type II error). Enrolling too many patients can be unnecessarily costly or time-consuming.
Link: Clin Calc.com
G*Power is a tool to compute statistical power analyses for many different t tests, F tests, χ2 tests, z tests and some exact tests. G*Power can also be used to compute effect sizes and to display graphically the results of power analyses.
Social science statistics
Here you'll find a set of statistics calculators that are intuitive and easy to use. Included are a variety of tests of significance, plus correlation, effect size and confidence interval calculators.