# Monthly vs weekly eras

What does exactly means monthly and weekly here?

Monthly means that between the beginning of two consecutive eras there is one month (or four weeks)?
Or monthly means that the length of period included in the era is a month?
Or monthly means that the performance is measured one month ahead?

And weekly means that between the beginning of two consecutive eras there is one week?
Or weekly means that the length of period included in the era is a week?
Or weekly means that the performance is measured one week ahead?

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Someone correct me if Iâ€™m wrong but I believe that weekly or monthly refers to what length each era is. So for example in the proposed val 1, the eras refer to months whereas the test1 era will refer to weeks. this is why each era in a â€śweeklyâ€ť section is much higher than an era from a â€śmonthlyâ€ť section.

Hope this makes sense and helps

The only thing that could makes sense for me is that monthly means that the beginning between eras are spaced by four weeks and the weekly means that the beginning are spaced only by one week.
That is, in one year of training there are 13 eras (13 x 4 = 52 weeks) and in a year if test there are 52 eras.
This is very importat because if this is true, in training eras donâ€™t overlap, but in test do.

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Sorry if Iâ€™m not being clear, there are 120 eras in the training cohort, given that we have been told this is 10 years of data, it is reasonable to assume that each monthly era is equivalent to one month (out of 12, rather than 4 weeks out of 52). If this is the case (which i think it is), then the weekly eras will overlap the monthly eras in the test data (only by a bit).

so era 120 of training data is month 120. era 121 in val1 is month 121, through to era 212 in val2 which is month 212. test eras (which are in between val eras) are weekly so era 575 of test1 is actually a monthly era of 132 and then 576 is a monthly era of 132.5, 577 is monthly 132.8. and so on.

this is given the basis that there are 52.1429 weeks in a year, which when divided by 12 months = 4.34524. so divide each â€śweeklyâ€ť era by this number to get the monthly era.

At least, this is the basis i have been working off and would love someone to comment if they believe it to also be true or different?

Edit: they said they will change this format soon so that we have pretty much all the data in training, mostly as weekly eras, thus meaning this could change relatively soon

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