# Core Competency Quantitative Evaluation of Air Traffic Controller in Multi-Post Mode
## 5 Example Verification and Analysis
### Questionnaire Data Analysis
#### 5.2.3 Validity Analysis  
Validity analysis is usually used to study the rationality and scientificity of the questionnaire items. Exploratory factor analysis (EFA) is used to test the validity of the questionnaire data through a comprehensive analysis of statistical indexes such as KMO (Kaiser-Meyer-Olkin) value, commonality, variance interpretation rate, and factor load coefficient. The KMO value is used to judge the suitability of information extraction, the common degree value is used to exclude unreasonable research items, the variance interpretation rate value is used to explain the level of information extraction, and the factor load coefficient is used to measure the correspondence between factors (dimensions) and measurement items (secondary indexes).  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Demographic Information** & **Frequency** & **Percentage (\%)** \\ \hline \multirow{4}{*}{Age} & \(>\)50 years old & 66 & 6.75 \\  & 40–50 years old & 169 & 17.28 \\  & 30–40 years old & 418 & 42.74 \\  & \(\leq\)30 years old & 325 & 33.23 \\ \hline \multirow{4}{*}{Work Post} & TWR post & 171 & 17.48 \\  & APP post & 357 & 36.50 \\  & ACC post & 275 & 28.12 \\  & Related post & 175 & 17.89 \\ \hline \multirow{4}{*}{Qualification} & \(\geq\)Second-level ATCO & 395 & 40.39 \\  & Third-level ATCO & 237 & 24.23 \\ \cline{1-1}  & Fourth-level ATCO & 118 & 12.07 \\ \cline{1-1}  & Fifth-level ATCO & 132 & 13.50 \\ \cline{1-1}  & Intern ATCO & 96 & 9.82 \\ \hline \multirow{4}{*}{Working year} & \(\geq\)20 years & 185 & 18.92 \\  & 10–20 years & 344 & 35.17 \\ \cline{1-1}  & 5–10 years & 216 & 22.09 \\ \cline{1-1}  & \(\leq\)5 years & 233 & 23.82 \\ \hline \multirow{4}{*}{Education background} & Master degree and above & 74 & 7.57 \\ \cline{1-1}  & Undergraduate college & 888 & 90.80 \\ \cline{1-1}  & Junior college and below & 16 & 1.64 \\ \hline \multicolumn{2}{c}{Total} & 978 & 100.0 \\ \hline \hline \end{tabular}
\end{table}
Table 3: Frequency statistics.  
From the perspective of professional analysis, the EFA method initially sets the factor number to eight and analyzes thirty-one core competency evaluation index items. The measurement relationship indexes between the three measurement items of \"\(x_{6}\) keep aircraft identification\", \"\(x_{7}\) manage the traffic situation\", \"\(x_{17}\) air traffic control experience\" and other factors are not good, so the three items should be deleted. After deletion, the number of factors is set to seven again. For the analysis of 27 index items, the common degree values corresponding to all items are higher than 0.4, and there is no need to delete any item. KMO and Bartlett sphericity tests are performed: the KMO value is 0.910, greater than 0.6, indicating that the data can be effectively extracted information. The sphericity test value is 0, less than 0.05, and the seven factors are judged to be suitable for factor analysis. In addition, the absolute value of the factor loading coefficient is greater than 0.4, and the corresponding relationship between seven factors and 28 items is confirmed, which is consistent with the expectation and does not need to be adjusted. The variance interpretation rates of the seven factors are 16.453%, 13.019%, 10.888%, 10.751%, 10.535%, 8.917%, and 6.038%, respectively. The cumulative variance interpretation rate after rotation is 76.601% > 50%, It shows that the questionnaire data has high construct validity.  
Finally, the seven factors (dimensions) extracted are named as follows: \(F_{1}\) Separation and conflict resolution(SCR), \(F_{2}\) Situational awareness(SAW), \(F_{3}\) Communication and coordination(CCO), \(F_{4}\) Self-management(SFM), \(F_{5}\) Workload management(WLM), \(F_{6}\) Traffic and capacity management(TCM), \(F_{7}\) Non-routine situations management(NRS). Thus, the General model of the ATCO core competency index system is constructed as shown in Figure 3, including seven dimensions and 28 secondary indexes.  
Figure 3: General model indexes of ATCO core competency.