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How to get the equation of a trend line in Calc? [closed]

asked 2014-07-13 10:36:36 +0200

student gravatar image

updated 2014-07-13 10:55:40 +0200

bencomp gravatar image

Suppose I have a (xy scatter) diagram in localc and insert a trend line, for example a linear one of the type f(x) = ax + b. I know hot to display the equation in the diagram, but how can I reference to the parameters a and b in a cell to make further calculations with it?

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Closed for the following reason the question is answered, right answer was accepted by Alex Kemp
close date 2016-03-04 23:56:25.817643

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@karolus: LO Calc :)

bencomp gravatar imagebencomp ( 2014-07-13 10:56:21 +0200 )edit

Oh, in ubuntu libreoffice calc can be started using the command localc

student gravatar imagestudent ( 2014-07-13 11:03:47 +0200 )edit

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answered 2014-07-13 12:00:28 +0200

ROSt52 gravatar image

updated 2014-07-13 12:00:53 +0200

@student - As you know how to display the trend line equation just look at the equation and take the parameters you need. The parameters have a high number of digits thus the result should be sufficiently precise.

Due to complexity reasons I feel the the equations @karolus indicates are only available for linear trend lines.

An enhancement request to copy the parameters from trend line equations appears to me as a very interesting one.

Please feel free to post such an enhancement request at: https://www.libreoffice.org/get-help/... and publish the bug number here to allow other to add comments.

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@ROSt52. I found a good solution to the problem link. I also filed a bug.

erotavlas gravatar imageerotavlas ( 2017-09-18 12:43:24 +0200 )edit
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answered 2014-10-15 01:12:01 +0200

blindape gravatar image

To extract the trend line data from a series of x an y values, you can use the LINEST function. This function returns the values for s and b from your equation above. It can also return other tests such as the r squared value.

Because LINEST returns multiple results, it must be entered as an array formula. You do this by pressing Ctrl+Shift+Enter when you finish entering the formula. The results are returned to multiple cells. Approximately 2 columns wide by 5 rows high.

LINEST takes 4 arguments. 1 a list of Y-Values, 2 a list of x-values, 3 enter TRUE to force the vertical axis intercept to 0 or false for it to be calculated. 4. Enter TRUE to return regression statistics and FALSE to only return the values for a and b.

let us know if you have any questions.

Cheers,

John

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answered 2014-10-13 02:06:03 +0200

arielCo gravatar image

A less-than-convenient workaround:

Copy the equation in the chart to clipboard.

Start a new OO Draw window: File > New > Drawing

Paste the equation

Select the equation and right-click > Break

Now you can click into the text and copy/paste it as plain text anywhere you like.

From [Solved] Copy trendline equation as plain text

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It really work, thank you!

Jekis gravatar imageJekis ( 2017-03-08 16:13:47 +0200 )edit

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Asked: 2014-07-13 10:36:36 +0200

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Last updated: Oct 15 '14