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  1. OASIS Open Document Format for Office Applications (OpenDocument) TC
  2. OFFICE-3958

Add polynomial regression type, force-intercept and regression-name

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    • Proposal:
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      In Section 20.43 chart:regression-type add the following item to the list (sub- and superscript seems to not work properly, but I think, you know to write a polynomial in x of degree n):

      • polynomial - Polynomial regression - approximate the values of the series using the model: y = A~0~ + A~1~  x + A~2~  x^2^ + ... + A~n~ x^n^ where n is given by the chart:regression-max-degree attribute.

      The generated attribute list changes to:

      The values of the chart:regression-type attribute are none, linear, logarithmic, exponential, power and polynomial.

       

      Add these new sections in chapter 20

      chart:regression-max-degree
      The chart:regression-max-degree attribute specifies the maximum degree of a polynomial regression curve. This attribute is only evaluated together with attribute chart:regression-type and if that has the value polynomial.
      The value of the chart:regression-max-degree attribute must be greater than or equal to 2.
      The default value for this attribute is 2.

      The generated text is then:
      The chart:regression-max-degree attribute is usable with the following element: <style:chart-properties> 17.22.
      The chart:regression-max-degree attribute has the data type positiveInteger.

      chart:regression-force-intercept
      The chart:regression-force-intercept attribute specifies whether a regression curve of type linear, exponential or polynomial must intercept the y-axis at a certain value.
      The defined values for the chart:regression-force-intercept attribute are:
      • true: The regression curve intercepts the y‑axis at the value, which is defined by the chart:regression-intercept-value attribute.
      • false: The interception of regression-curve and y-axis is calculated from the data series.
      The default value for this attribute is false.
      This attribute is only evaluated together with attribute chart:regression-type and if that has one of the following values: linear, exponential or polynomial.

      The generated text is then:
      The chart:regression-force-intercept attribute is usable with the following element: <style:chart-properties> 17.22.
      The chart:regression-force-intercept attribute has the data type boolean.

      chart:regression-intercept-value
      The chart:regression-intercept-value attribute specifies where a regression curve must intercept the y-axis, if attribute chart:regression-force-intercept is true.
      This attribute is only evaluated together with chart:regression-force-intercept attribute.
      The default value for this attribute is 0 in case of regression type linear or polynomial, and the default value is 1 in case of regression type exponential.

      The generated text is then:
      The chart:regression-intercept-value attribute is usable with the following element: <style:chart-properties> 17.22.
      The chart:regression-intercept-value attribute has the data type double.

      chart:regression-name
      The chart:regression-name attribute specifies a name of a regression curve.
      Default value is an empty string.

      The generated text is then:
      The chart:regression-name attribute is usable with the following element: <style:chart-properties> 17.22.
      The chart:regression-name attribute has the data type string.

      The needed change to the schema is given by this diff:

      --- OpenDocument-schema-v1.3_ohneTab.rng	2018-06-06 00:01:34.171094900 +0200
+++ OpenDocument-schema-v1.3_regression_curve1.rng	2018-06-05 23:59:49.276136600 +0200
@@ -9993,14 +9993,35 @@
             <rng:value>none</rng:value>
             <rng:value>linear</rng:value>
             <rng:value>logarithmic</rng:value>
             <rng:value>exponential</rng:value>
             <rng:value>power</rng:value>
+            <rng:value>polynomial</rng:value>
           </rng:choice>
         </rng:attribute>
       </rng:optional>
       <rng:optional>
+        <rng:attribute name="chart:regression-max-degree">
+          <rng:ref name="positiveInteger"/>
+        </rng:attribute>        
+      </rng:optional>
+      <rng:optional>
+        <rng:attribute name="chart:regression-force-intercept">
+          <rng:ref name="boolean"/>
+        </rng:attribute>
+      </rng:optional>
+      <rng:optional>
+        <rng:attribute name="chart:regression-intercept-value">
+          <rng:ref name="double"/>
+        </rng:attribute>
+      </rng:optional>
+      <rng:optional>
+        <rng:attribute name="chart:regression-name">
+          <rng:ref name="string"/>
+        </rng:attribute>
+      </rng:optional>
+      <rng:optional>
         <rng:attribute name="chart:axis-position">
           <rng:choice>
             <rng:value>start</rng:value>
             <rng:value>end</rng:value>
             <rng:ref name="double"/>

       

       

      Show
      In Section 20.43 chart:regression-type add the following item to the list (sub- and superscript seems to not work properly, but I think, you know to write a polynomial in x of degree n): polynomial - Polynomial regression - approximate the values of the series using the model: y = A~0~ + A~1~  x + A~2~  x^2^ + ... + A~n~ x^n^ where n is given by the chart:regression-max-degree attribute. The generated attribute list changes to: The values of the chart:regression-type attribute are none , linear , logarithmic , exponential , power and polynomial .   Add these new sections in chapter 20 chart:regression-max-degree The chart:regression-max-degree attribute specifies the maximum degree of a polynomial regression curve. This attribute is only evaluated together with attribute chart:regression-type and if that has the value polynomial . The value of the chart:regression-max-degree attribute must be greater than or equal to 2. The default value for this attribute is 2. The generated text is then: The chart:regression-max-degree attribute is usable with the following element: <style:chart-properties> 17.22. The chart:regression-max-degree attribute has the data type positiveInteger . chart:regression-force-intercept The chart:regression-force-intercept attribute specifies whether a regression curve of type linear , exponential or polynomial must intercept the y-axis at a certain value. The defined values for the chart:regression-force-intercept attribute are: • true : The regression curve intercepts the y‑axis at the value, which is defined by the chart:regression-intercept-value attribute. • false : The interception of regression-curve and y-axis is calculated from the data series. The default value for this attribute is false . This attribute is only evaluated together with attribute chart:regression-type and if that has one of the following values: linear , exponential or polynomial . The generated text is then: The chart:regression-force-intercept attribute is usable with the following element: <style:chart-properties> 17.22. The chart:regression-force-intercept attribute has the data type boolean . chart:regression-intercept-value The chart:regression-intercept-value attribute specifies where a regression curve must intercept the y-axis, if attribute chart:regression-force-intercept is true . This attribute is only evaluated together with chart:regression-force-intercept attribute. The default value for this attribute is 0 in case of regression type linear or polynomial , and the default value is 1 in case of regression type exponential . The generated text is then: The chart:regression-intercept-value attribute is usable with the following element: <style:chart-properties> 17.22. The chart:regression-intercept-value attribute has the data type double . chart:regression-name The chart:regression-name attribute specifies a name of a regression curve. Default value is an empty string. The generated text is then: The chart:regression-name attribute is usable with the following element: <style:chart-properties> 17.22. The chart:regression-name attribute has the data type string . The needed change to the schema is given by this diff: --- OpenDocument-schema-v1.3_ohneTab.rng 2018-06-06 00:01:34.171094900 +0200 +++ OpenDocument-schema-v1.3_regression_curve1.rng 2018-06-05 23:59:49.276136600 +0200 @@ -9993,14 +9993,35 @@ <rng:value> none </rng:value> <rng:value> linear </rng:value> <rng:value> logarithmic </rng:value> <rng:value> exponential </rng:value> <rng:value> power </rng:value> + <rng:value> polynomial </rng:value> </rng:choice> </rng:attribute> </rng:optional> <rng:optional> + <rng:attribute name= "chart:regression-max-degree" > + <rng:ref name= "positiveInteger" /> + </rng:attribute> + </rng:optional> + <rng:optional> + <rng:attribute name= "chart:regression-force-intercept" > + <rng:ref name= "boolean" /> + </rng:attribute> + </rng:optional> + <rng:optional> + <rng:attribute name= "chart:regression-intercept-value" > + <rng:ref name= "double" /> + </rng:attribute> + </rng:optional> + <rng:optional> + <rng:attribute name= "chart:regression-name" > + <rng:ref name= "string" /> + </rng:attribute> + </rng:optional> + <rng:optional> <rng:attribute name= "chart:axis-position" > <rng:choice> <rng:value> start </rng:value> <rng:value> end </rng:value> <rng:ref name= "double" />    

      Description

      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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            • Assignee:
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              Reporter:
              regina.henschel Regina Henschel
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                Updated:
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