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Frequencies panel

Frequencies panel

 

The Frequencies panel shows the data to be analyzed.  Data must consist of the frequencies (numbers of occurrences) of two kinds of outcome.  In a difference test, these are the numbers of correct and wrong trials.  If they do not come from a difference test, DiffTest characterizes them as just as the frequency of A and the frequency of Not A.

It can be useful when planning an investigation to insert various imaginary results in the Frequencies panel to get an idea of the conclusions that would follow from the sorts of outcomes that are envisaged.

The Total trials window adjusts the total amount of data.  This may be the number of trials or events actually observed (if you are analyzing data already collected) or may be a hypothetical value if you are using DiffTest to plan an investigation.  The entry in this window is always the sum of the entries in the other two windows in the Frequencies panel.

The Number correct window adjusts the number of trials that count as correct if you are analyzing a difference test

The Number wrong window adjusts the number of trials that count as wrong when analyzing a difference test. 

All the above may be numbers actually observed (if you are analyzing data already collected) or hypothetical values if you are using DiffTest to plan an investigation.

When not analyzing a difference test, the probability in the rightmost window of the Task panel is usually typed in directly.  When this is done, the two categories in the Frequencies panel are not necessarily Right and Wrong, so the Number correct window becomes labelled Number of A and the Number wrong window is labelled Number not A.  Data consisting of observed frequencies of any two kinds can be entered.  Examples are Sweet-Not Sweet, Female-Male, Acceptable-Unacceptable, and so on.