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This is a .csv file with specimens in rows. The first row is a header row. The first column is a list of specimen names. The second column is a measurement of size. If you export an Excel spreadsheet as a comma-separated file, you should end up with the right format. You will have the option to log transform your data later.
Enter a file to upload:
Download a sample file: regr_table.csv
If you only have two variables to compare, you might use this regression page instead