Data are entered into the bottom text area. Each set of inspection data must have the same number of rows as intervals. Each row consists of 4 columns of integers, being the number of mortality and survival for that interval for group 1, and the same for group 2. The total number of rows therefore is the number of inspection multiplied by the number of intervals. Place the number of rows of data into the rows text box, click the Do Triangular Test button and results will show.
Program is available for detailed survival analysis of the set of data from any inspection.
The Triangular test is a sequential statistical method, based on the relationship between Fisher's information V and an expression of the effect size Z. V and Z can be calculated at any time during an experiemnts, and borders can be drawn that allows the decisions to continue with the experiment, to reject the null hypothesis and stop the experiment, or to accept the null hypothesis and stop the experiment. The constant a and c can be calculated according to a definition of the effect size Theta. The method of calculation for Theta is complex, but obtainable from a computer program PEST3, constructed by Prof. John Whitehead who described the method in the first place. I have calculated these coefficients using PEST3 with small graduations, and this program accesses these coefficients from a table. Depending on the frequency of inspection, a more sensitive border can be constructed.