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Editorial Team
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Asked: 2026-06-07T02:30:49+00:00

I have some data in an Excel spreadsheet, which represents a bunch of date-times

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I have some data in an Excel spreadsheet, which represents a bunch of date-times where samples have been taken. The dates are increasing linearly but there are some periodic gaps (leading to discontinuities in the date-data).

See the attached image as this shows the periodic nature of the data. Notice the rate of change shows clear spikes where discontinuities occur.

enter image description here

The data is a single column in an Excel spreadsheet of DateTimes. I would like to forecast this repeating series into the future so as to make estimates of future discontinuities.

Ultimately I want to code this in C# but if anyone has an idea of an algorithm that can perform such a forecast, either in Excel, or C#/C it would be great!

I thought about Auto-Correlation however can’t figure out how to do that in Excel to test it.

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1 Answer

  1. Editorial Team

    to explain my comments about correct data representation:
    enter image description here

    if the data can be represented by a linear function, i.e.:

    f(date) = start_value + daily_increase * (date - fist_date)

    then you can do a simple linear regression – in my excel example use this LINEST function (entered in 2 cells at the same time as an array formula with Ctrl+Shift+Enter):

    =LINEST(C2:C31;A2:A31)

    the results (6, -220436) are linear and constant factors of a linear regression formula:
    => f(date) = 6 * date - 220436

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