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Time Lag
Sometimes there is a time lag between cause and effect: it takes some time for the building system to react to a temperature change. In this case we can make dependence more pronounced if we would use temperature measured some time prior to measurement of the consumption value. This time shift is a lag. By varying lag we can get the highest possible correlation between two variables.
Figure 3-49 Plotted values for a 30 minute time lag setting.
So you can use the Lag setting to make the software adjust the compared data points by shifting correlated values in degrees of Days, Hours, or Minutes.
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