Hey!
I would like to plot the following expression but I have some problems with the second therm:
- .
Here I copy the explanation of the formula:
"The EWMA chart computes successive observations zi by computing the rational subgroup average, , and then combining that new subgroup average with the running average of all preceding observations, zi - 1, using the specially–chosen weight, λ."
My Data looks like this:
Date | Value |
2012.01.03 16:03:55 | 0,41 |
2012.01.03 20:31:43 | 0,434 |
2012.01.03 23:13:58 | 0,42 |
2012.01.04 13:56:06 | 0,431 |
2012.01.04 16:21:06 | 0,455 |
2012.01.04 22:14:28 | 0,45 |
2012.01.04 22:20:31 | 0,437 |
2012.01.04 22:26:45 | 0,448 |
2012.01.04 22:35:22 | 0,437 |
2012.01.04 23:16:09 | 0,449 |
2012.01.11 10:10:07 | 0,449 |
2012.01.11 10:37:04 | 0,422 |
The subgroups must be "days".
Thank you very much!!! This chart is driving me crazy!
Eduardo