What DiffTest does

It is a calculator for analyzing sensory difference data.


It is a versatile tool when seeking to show that products differ.


It is incomparable when seeking to show that products are similar


It calculates directional and non-directional statistical significance of results.


It calculates confidence bounds around the best estimate of success probability


It calculates the Discrimination index corresponding to the best estimate and its confidence bounds


It analyses any type of forced-choice difference test.


It can analyses any other data consisting of frequencies of two types, such as, right/wrong, agree/disagree, better/worse, male/female, sweeter/less sweet.


It can analyses the agreement of data from a sample with what would be expected from any particular population.


It uses exact probabilities, not approximations based on statistical distributions.


It is a powerful simulation and design tool for planning sensory tests.

How to use DiffTest

To use the calculator, just give any number in bold type (any of the 7 numbers in the top, right corner of the calculator) a new value. All the other numbers that depend on it will change immediately.

To select a window to change, you can

• Point to it with the mouse and drag over the number (or the part of it that you want to edit);
  

• Press the <Tab> key repeatedly to step through all the selectable numbers in turn.  Pressing <Shift> and <Tab> together steps in the reverse direction.

After selecting a number, you can type in new digits to replace what you had selected.