| 1 | The pareto method is a method based on risk frequency and cumulative percentage. | |
| 2 | The value of the boundary at the 25th, 50th, or 75th percentiles of a frequency distribution divided into four parts, each containing a quarter of the population. | |
| 3 | According to data provided by doctor, under the assumption that sample is normal, performed frequency analysis, pair test and variance analysis. | |
| 4 | Enumeration data is consisted of categorical variable. It is obtained by counting the frequency of the inhomogeneous data. | |
| 5 | Then, frequency and grey correlation is used to analyze the result of questionnaires and acquire the main factor. |
