Research Tools

Calculate survey or study response rate from completed responses and invitations.

Calculate the proportion of screened candidates who are eligible or enrolled.

Calculate participant dropout or attrition rate during a study.

Split a total sample between two study groups using a chosen allocation ratio.

Estimate how many clusters are needed for a target sample and average cluster size.

Calculate the approximate sampling interval for systematic sampling.

Generate one or more random integers within a selected range.

Randomly divide a pasted list of names or IDs into groups.

Generate sequential participant IDs with a prefix and zero padding.

Estimate study duration from a recruitment target, recruitment rate and follow-up period.