Tools

Calculate the f1 difference factor between reference and test dissolution profiles.

Calculate assay percentage relative to a stated reference amount or concentration.

Calculate analytical percent recovery from measured and expected amounts.

Generate concentrations across repeated equal-fold dilution steps.

Calculate density, mass or volume from two known quantities.

Convert between mass and amount of substance using molar mass.

Calculate chemical equivalent weight from molar mass and reaction-specific n-factor.

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

Generate sequential participant IDs with a prefix and zero padding.

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

Generate one or more random integers within a selected range.

Calculate the approximate sampling interval for systematic sampling.

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

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

Calculate participant dropout or attrition rate during a study.

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

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

Calculate Cronbach’s alpha from item variances and total-score variance.

Calculate Cohen’s kappa for agreement between two binary raters.

Estimate the attributable fraction among exposed individuals from a relative risk.

Calculate absolute risk difference from a 2×2 table.

Calculate the pooled z statistic for two independent proportions.

Calculate a one-sample z statistic for an observed proportion versus a hypothesized proportion.

Calculate Pearson’s chi-square statistic for a 2×2 contingency table.