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Subject: [OASIS Issue Tracker] (OFFICE-3958) Add polynomial regression type, force-intercept and regression-name

• From: OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>
• To: office@lists.oasis-open.org
• Date: Wed, 6 Jun 2018 16:38:00 +0000 (UTC)

```    [ https://issues.oasis-open.org/browse/OFFICE-3958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=70119#comment-70119 ]

Andreas Guelzow commented on OFFICE-3958:
-----------------------------------------

Some questions:

1) What exactly is "approximate the values of the series using the model:" supposed to mean? While the model is clear it is not clear to me what exactly is supposed to be minimized? The sum of the squares of the differences between the observed and predicted y-values (i.e. assuming that the x-values are precise and only the y-values) or perhaps the sum of the squares of the distances between the observed values and the curve (i.e. both the x- and y-values may carry error)?

2) {{chart:regression-force-intercept }}is clearly related to the not here proposed chart:regression-min-degree since if min-degree>0, the y-intercept will always be 0.{{ }}

3) The *regression-intercept-value* and the *regression-force-intercept* appear to also apply to exponential and linear regression. We should be explaining how under these restrictions the model coefficients are to be calculated.

> Add polynomial regression type, force-intercept and regression-name
> -------------------------------------------------------------------
>
>                 Key: OFFICE-3958
>                 URL: https://issues.oasis-open.org/browse/OFFICE-3958
>             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
>          Issue Type: Improvement
>          Components: Chart
>    Affects Versions: ODF 1.2
>            Reporter: Regina Henschel
>            Priority: Major
>             Fix For: ODF 1.3
>
>
> This is a spin-off from OFFICE-1148. It contains the more complete parts, so that we can at least include these in ODF 1.3:
>  * Value {{polynomial}} for {{chart:regression-type}} attribute
>  * New attribute {{chart:regression-max-degree}}
>  * New attribute {{chart:regression-force-intercept}}
>  * New attribute {{chart:regression-intercept-value}}
>  * New attribute {{chart:regression-name}}
> I have not included {{chart:regression-min-degree}} attribute from the original proposal, because such attribute is no where implemented.
> I'm unsure about some wording, see email.
> The green texts are comments.

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