That is purely mathematics thing, I think. You cannot draw regression curve of the specific type if you have too little data points. For example, if you have two points, you can draw a straight line through them in one way only, but you cannot do such a thing with a quadratic parabola in one way only.
2013/1/15 Jack Elliott <that.jack.elli...@gmail.com> > On Mon, 2013-01-14 at 18:01 -0800, That Jack Elliott wrote: >> >>> This might be a bonehead problem. I have a line chart displaying a >>> column of >>> data -- numbers between 170 and 190. If I doubleclick the chart and add >>> an >>> Exponentially Smoothed Curve to Series1, it plots on the chart. Same for >>> a >>> Moving Average trend line. But I'd like to do a Polynomial trend line, >>> and >>> can't figure out how to make it display. It looks like it wants more >>> information, like "low bound" and "high bound." I can't find any >>> information >>> on what to enter into those field and I've Googled all over the darn >>> place. >>> >> You should not need to specify the low and high bound. You only need a >> reasonable "order". If you have n data points the order should be at >> most n-1. Otherwise there is no curve to plot. >> >> Andreas >> > Thank you, where do I specify the order? For example, for trend line type > Logarithmic -- one of the trend line types that does not plot a curve -- I > see "Title," and the aforementioned High and Low Bound fields available for > data entry. > > I think this will go out as plain text. Do we bottom-post on this list? > > -- > That Jack Elliott > > ______________________________**_________________ > gnumeric-list mailing list > gnumeric-list@gnome.org > https://mail.gnome.org/**mailman/listinfo/gnumeric-list<https://mail.gnome.org/mailman/listinfo/gnumeric-list> > -- Ar cieņu, Igors Mihailovs С уважением, Игорь Михайлов
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