Table 1
Peak Cross-correlation
| ILI | GIID | |||||
| Correlation | Lag (Days)* | Correlation | Lag (Days)* | |||
| IFH structured—IFH narrative | 0.88 (0.85–0.91) | 0 | 0.51 (0.42–0.59) | (0) | ||
| IFH structured—NYC isolates | 0.89 (0.76–1.00) | 1 | ||||
| IFH narrative—NYC isolates | 0.84 (0.71–0.97) | 3 | ||||
| IFH structured—NYC ED | 0.93 (0.91–0.94) | 0 | 0.81 (0.67–0.94) | (−2) | ||
| IFH narrative—NYC ED | 0.88 (0.84–0.91) | 0 | 0.47 (0.33–0.61) | (−6) | ||
| NYC ED—NYC isolates | 0.92 (0.79–1.00) | −1 | ||||
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ILI = Influenza-like Illness; GIID = Gastrointestinal infectious diseases; IFH = Institute for Family Health; NYC = New York City; NYC ED = New York City Emergency Department.
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↵* A negative number implies the first series in the pair occurred first. The lags for GIID are shown in parentheses because they lacked high peak correlation and good cross-correlation structure, so the values are likely to be unreliable.
