Exact(7)
All these measures were highly correlated (TSPs on the day of investigation with TSPs the day before, r = 0.83; TSPs on the day of investigation with the of the week before, r = 0.82), and the effect estimates did not change; that is, all relative differences of means ratios between models of different lags were < 1%.
The new method is a modification of Belanger's recursive method, to avoid an expensive computational cost in inverting error covariance matrices of product of innovation processes of different lags when the number of observations becomes large.
where r ( x s + x v ) ( s + v ) ( n − k 0 ) consists of different lags of cross-correlation between the echo signal x s (n)+x v (n) and the noisy input signal s(n)+v(n), while R(s+v)(s+v) is the auto-correlation matrix of s(n)+v(n).
Table 4 summarizes the effects of different lags of PM10 on several mortality outcomes.
This results in not only limited statistical power, but in an inability to compare effects of different lags on the outcome for the same event day.
A more realistic model would include a distribution p of different lags λ between exposure and LE change, replacing Eq.23 by Results are plotted in Fig. 4 for three models.
Similar(53)
According to the sensitivity test of different lag days, in this study we quantified the "heat effect" as the extreme heat-related mortality risk with 0 3 lag days; and we used the models with lags of 0 21 days to calculate the extreme cold-related mortality risk as the "cold effect".
A sensitivity analysis of different lag structures revealed lag 0 2 to be a good fit without losing too much data.
Sensitivity analyses of different lag weeks showed that although magnitudes of peaks are somehow sensitive to the lag weeks, the two-peak pattern of seasonal effects of influenza is relatively robust to the changes of lag weeks.
For the subsequent analyses we used the best lag week, which had the smallest p-value for coefficients β among the four models of different lag weeks for each outcome.
The 4-week block lags do not isolate the effects of those time windows because each week is correlated in both space and time; thus, future studies to model the specific contributions of different lag weeks would be beneficial in understanding these effects.
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