Interrupted Time Series for Composite Quality Measures (YC)
| Model Validation and Parameter Estimation | Diagnostic tests | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Intercept | Time (β1) | Intervention (β2) (Change in level) | Tim_Aft_Int (β3) (Change in slope) | Autocorrelation (AC) Check Durbin Watson | Test for seasonality/stationarity (Dickey-Fuller unit-root test) | |||||||||
| Dimension | MODEL | Value | p Value | Value | p Value | Coefficient 95% CI (LCI-UCI) | p Value | Coefficient 95% CI (LCI-UCI) | p Value | R2 | D-Value (before) | D-Value (after) | p Value | Result |
| Mean_ Composite† | Yc | 75.41 | 0.00** | 2.19 | 0.00** | −3.95 (−6.39 to −1.51) | 0.00** | −2.16 (−2.52 to −1.80) | 0.00** | 0.87 | 1.56 | – | 0.00** | No seasonality/data are stationary |
†The composite quality measure (YC) is the mean of the 23 quality measures; **p≤0.001.