Most data are available in case form with data for each sampling unit. Sometimes data are not available for each unit but are already summarized by counting the frequency of occurrences of each value, called frequency form data.
Whenever possible you should record data in case form. Case form data can be reduced to frequency form, but frequency form data cannot be reconstructed into case form. You may want to use frequency form data when working with a large amount of data from a database, where you can save computing resources by letting the database server tabulate the data.
Each column is a variable (Height, Eye color), each row is a separate case (Subject) with the values of the variables on that case.
Each column is a variable (Eye color) and a seperate column for the number of cases (Frequency), each row is a combination of categories with the frequency count.
We've been developing intuitive high-quality statistical software at an affordable price, backed up by fast friendly customer service for over 25 years...
Office hours: 9am-5pm GMT Mon-Fri
It's Tuesday 5:02 PM and the office is closed - e-mail us and we'll get back to you as soon as possible.