Hello,

I am new on this list, and I would like to present myself. I am a teacher and a researcher in the Institute of Technology of University of Rouen (France). I am dealing with chemical engineering, and be using OOo from a couple of years. I made few contributions to OOo project (help users on forum, correct some How-To for doc-fr,...), but not much... so far. The feature in OOo which is lacking more for me is polynomial regression curve (issue 20819). Ingrid Halama and me wrote a proposition for a file format change in ODF, in order to be able to add polynomial regression curve. It is obvious that asking a file format change only for polynomial regression curve is unproductive. That's why the proposition include other important issues for trend lines:
- moving average trend line (issue 66819)
- force intercept (issue 34093)
- extrapolate (issue 5085)

Do you see some other features that are missing to trend lines? I made the comparison with MS-Excel only, but other spreadsheet may have interesting features.

With this four first features, there are things that should be discussed before asking to OASIS TC a file format change: - polynomial trend line: exponential terms is an option, but is it necessary? - moving average trend line: by default it is prior moving average. What about adding central moving average ? Is it necessary, or will there be too many parameters, most of them useless?

For a practical reason, I do not attach yet the proposal, because I am not sure that robot will accept message with attached file. How to proceed to give you the file? With a wiki? With IssueZilla? Or another place?

Many thanks in advance for your answers.

Laurent BP

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