Copy Data Directly from a Spreadsheet

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Copying each column separately allows you to choose which covariates you want to include in the randomization. Each box in the randomizer will then have a list of values separated by spaces.

Analyze Your Data

This page shows a histogram and important values for your first covariate. If this histogram adheres closely to a normal distribution, then you don't have to stratify it in the randomization process, so you would click "Do Not Stratify." If the data doesn't adhere to a normal distribution (like this example data) then click on "Stratify." Repeat this process for each covariate

Choose Your Number of Treatment Groups

Choose the number of treatment groups you want to randomize your samples into

View and Balance the Randomized Results

The first table is the mean of each covariate in each group. The second table is the actual group assignments found using stratified covariate randomization.

Analyze the first table and find any imbalances in the covariates. In this example data, in Covariate 3, Group 2's mean is substantially higher than the others. To fix this, click the "Improve Balance" button, select Covariate 3, and then the website will run an optimization algorithm. This algorithm will swap 2 samples between their groups to balance the selected covariate while still maintaining the majority of the randomized data.

Be very intentional about this balancing process though, because the more times you balance, the less "random" your group assignments become.

Finalize the Randomized Results

Once you are happy with the balanced data, Click "Finalize Groups." This will show you a table of the final grouping assignments. View this table, then, at the bottom of the page, click the "Copy Table To Clipboard" button, and paste your results back into your spreadsheet.