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I have a series which is cumulative monthly data (that is, Jan is Jan's data, Feb is the sum of Jan and Feb, and so on). What is the best way to convert it to non-cumulative monthly data? Thanks.

Also, a separate question: what is the command in Eviews to create a index, say Jan 2006=100? Thanks so much.

I have a series which is cumulative monthly data (that is, Jan is Jan's data, Feb is the sum of Jan and Feb, and so on). What is the best way to convert it to non-cumulative monthly data?

series z = d(your_series)
z(1) = your_series(1)

what is the command in Eviews to create a index, say Jan 2006=100?

series z_ind = 100*your_series/@elem(your_series,"2006M01")

trubador: thanks a lot for your help. The second question is solved (I was thinking the same approach but was wondering if there is a simpler command to do it, like rebase( ) :)

However, with regard to my first question, the problem remains. My data is multi-year data, so if I replace z(1)=series(1), only Jan of the first year is corrected. Januarys for the remaining years are still incorrect (being equal to Jan minus last Dec ytd). Any suggestions? Thanks!

Where y is the series that contains year-to-date, and z is the series you want to contain levels.



For what it is worth, to go the other way (i.e. from levels to year-to-date), you could do:

Eviews Gareth: thank you so much! It really helps.

Code: Select all

series z = @recode(@month=1,y,d(y))

Where y is the series that contains year-to-date, and z is the series you want to contain levels.



For what it is worth, to go the other way (i.e. from levels to year-to-date), you could do:

Code: Select all

series y = @recode(@month=1,z,z+y)

I have a series with yearly data and I want to convert it to monthly data.
It's for a regression and when you take the dlog you get no growth rates (because it's the same number for 12 months).

My question is: How do I convert my yearly data to monthly data?

Thanks!

Create a monthly page in the same workfile, then copy the yearly data over to the monthly page.