Sign Test

• The Sign test is a non-parametric statistical test of difference that allows a researcher to determine the significance of their investigation.
• A Sign test is used in studies that have used a repeated measures design, where the data collected is nominal.
• The Sign test is sometimes referred to as a Binomial Sign test.
• A Sign test will calculate it's value using positive and negative signs from the data set.
• In a Sign test the column with the lowest number of either positive or negative signs becomes the S value.
• In a Sign test the calculated value (S) is compared to a table of critical values to see if it is significant.
• In a Sign test the calculated S value must be less than or equal to the critical value to be significant.
• The purpose of comparing the calculated value (S) to a table of critical values in a Sign test is to determine whether the observed difference between two related samples is statistically significant or due to chance.