Common test method used by testers --- orthogonal method

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Orthogonal experiment is a design method to study multi factors and multi levels , It is based on Galois The theory selects some representative horizontal combinations from the overall experiment to carry out the experiment , And the results are analyzed to find the optimal level combination .

When the factorial design requires too many experiments , A very natural idea is from the horizontal combination of factorial design , Select a part of the representative level combination for the experiment . So fractional factorial design appears (fractional factorial designs), But for the practical workers who have little knowledge of experimental design , It is difficult to choose proper fractional factorial design . For example, make an experiment of three factors and three levels , According to the requirements of the comprehensive experiment , Must be carried out 3^3=27 Experiments on combinations of species , And the number of repetitions of each combination has not been considered . If pressed L9(3^4) Orthogonal table arrangement experiment , Just do 9 Time , Press L15(3^7) Orthogonal table 15 Experiments , Obviously, the workload is greatly reduced . thus Orthogonal experimental design It has been widely used in many fields .

Composition of orthogonal table ：

l Row number (Runs)： The number of rows in an orthogonal table , That is, the number of tests , It is also the number of test cases designed by orthogonal experiment

l Factor number (Factors)： The number of columns in an orthogonal table , That is, the function point to be tested .

l Horizontal number (Levels)： The maximum number of values that can be obtained by any single factor , That is to test the input value of the function point

among ： Row number = Factor number x（ Horizontal number -1）+1

Select the corresponding orthogonal table according to the number of factors and the number of levels , Design test cases

（ Orthogonal table reference address (2 Bar message ) Test cases are designed by orthogonal method _ Orthogonal test case , Test cases are designed by orthogonal method - Other code resources -CSDN library https://download.csdn.net/download/weixin_38669628/11111731?spm=1001.2101.3001.6661.1&utm_medium=distribute.pc_relevant_t0.none-task-download-2%7Edefault%7ECTRLIST%7EPaid-1.pc_relevant_default&depth_1-utm_source=distribute.pc_relevant_t0.none-task-download-2%7Edefault%7ECTRLIST%7EPaid-1.pc_relevant_default&utm_relevant_index=1）