Discounting-interpolating input data

I'm trying not to have yearly data, to reduce the amount of data I have to input into the model. So I have included datayears, in 5 years periods. I know that if I include yearly data, then Times interpolates/extrapolates the data to the milestone years. So, if I decide to have datayears=milestone years every five years, for example, then I should be doing the interpolation between the yearly data and the datayears included in my model, am I right? In this case, what fomula should I use?

Up to now, my data is discounted and yearly, in constant dollars, and I'm wondering if a simple average of the 5 year period is correct or If I should use a different formula.




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Discounting-interpolating input data - by sld - 06-03-2013, 11:19 PM
Discounting-interpolating input data - by Antti-L - 07-03-2013, 05:56 AM
Discounting-interpolating input data - by sld - 07-03-2013, 10:22 PM

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