/kloc-I learned it 0/0 years ago, and I usually use it, but now I'm learning it again. Let's review together, because there are too many things like statistical analysis, so it should be interesting to start with the outline and then go deep into the application and practice of software, such as Minitab, JMP, Python or data mining (mainly data analysis and mining).

Figure 1, just to illustrate:

From a mathematical point of view, X is usually an independent variable, and Y is usually a dependent variable (subordinate to X). A process,

Output is subordinate to input, so it makes sense to specify input as x and output as y. This term is the same as Six Sigma.

1)? Classic DOE: the total factor method reduces factors (reduces variables).

2)? Taguchi DOE:? Classical method is adopted and simplified by orthogonal table.

3)? Xie Ning doe:? 10 method, the number of tests is less (for example, 32 tests are usually done).