How many options or levels does the group variable with the most options have?
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More Information (if you need help deciding)
Two Options: This means you have two group variables, for example gender (male/female) and lives in US (yes/no), and each has two options or levels.
More Than Two Options: This means you have two group variables and at least one of them has more than two options. For example, gender (two options in male/female) and eye color (more than two options in blue, green, brown, hazel, etc.).