English to Portuguese Medical Mathematics & Statistics

Lags k were between -
6 and 6; negative lags allowed verification if the association was directional. To show a potential causal relationship between ILI and GBS, we would expect that some of the backward-lagged (k > 0) regression coefficients or cross-correlation coefficients would be statistically significant and that none of the forward-lagged (k < 0) coefficients would be statistically significant