Differentiate between the long and wide format data.

Answer»

Long format Data	WIDE-Format Data
Here, each row of the data REPRESENTS the one-time INFORMATION of a subject. Each subject would have its data in different/ multiple rows.	Here, the repeated responses of a subject are part of separate columns.
The data can be recognized by considering rows as groups.	The data can be recognized by considering columns as groups.
This data format is most commonly used in R analyses and to write into log files after each trial.	This data format is rarely used in R analyses and most commonly used in stats packages for repeated measures ANOVAs.

The following IMAGE depicts the REPRESENTATION of wide format and long format data:

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