This menu allows you to calculate the number of replicates (sample size) or the power required
for a Sign test. The sign test is a nonparametric test for difference in location between two
related samples, or for testing the location of a single sample.
Calculation
Specifies the calculation to be carried out: Sample size, or Power.
Probability of response
Specifies the probability of response (i.e. the probability that an observation in one
sample will be greater than the equivalent observation in the other sample) that should
be detectable.
Significance level Alpha
Specifies the significance level at which the response is to be tested.
Probability of detection (Power)
For a sample size calculation this specifies the required probability for detection of the
response (that is, the power of the test).
Sample Size
For a power calculation this specifies the sample size to be used to calculate the probability
of detection (power).
Type of Test
Allows you to choose either a one-sided or two-sided test.
Power Plot
When selected, produces a plot of power versus sample size. When Sample Size is selected
for the type of calculation the plot is generated using 11 replication values
centred around the required number of replicates for the requested power. When Power
is selected you can specify a range of sample size values for the plot in the
spaces provided.