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To obtain the average value for each date, considering the values from the earliest time until that date, you would need to calculate a cumulative average.

The cumulative average is calculated by adding up all the values from the earliest time until that date and dividing by the number of values. This will give you the average value up until that date.

For example, if you have the following data:

Date Value Jan 1 10 Jan 2 15 Jan 3 12 Jan 4 18

To calculate the cumulative average for Jan 1, you would simply take the value for Jan 1, which is 10. To calculate the cumulative average for Jan 2, you would take the sum of the values for Jan 1 and Jan 2 (10 + 15 = 25) and divide by the number of values, which is 2. This gives you a cumulative average of 12.5 for Jan 2.

To calculate the cumulative average for Jan 3, you would take the sum of the values for Jan 1, Jan 2, and Jan 3 (10 + 15 + 12 = 37) and divide by the number of values, which is 3. This gives you a cumulative average of 12.33 for Jan 3.

You can continue this process for each date to obtain the cumulative average up until that point.