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    <title>topic Re: Predicting an unknown from a trend line in Discussions</title>
    <link>https://community.jmp.com/t5/Discussions/Predicting-an-unknown-from-a-trend-line/m-p/57959#M32230</link>
    <description>&lt;P&gt;A million thanks.&lt;/P&gt;&lt;P&gt;I never would have found all the right buttons to click on without your guidance.&lt;/P&gt;&lt;P&gt;Austin&amp;nbsp;&lt;/P&gt;</description>
    <pubDate>Wed, 23 May 2018 14:54:48 GMT</pubDate>
    <dc:creator>ACooper</dc:creator>
    <dc:date>2018-05-23T14:54:48Z</dc:date>
    <item>
      <title>Predicting an unknown from a trend line</title>
      <link>https://community.jmp.com/t5/Discussions/Predicting-an-unknown-from-a-trend-line/m-p/57887#M32191</link>
      <description>&lt;P&gt;Simple question and would appreciate some assistance.&amp;nbsp; I am not a stats wiz.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;the absorbance of the unknown is 0.027&lt;/P&gt;&lt;P&gt;I need to find the concentration of the unknown.&lt;/P&gt;&lt;P&gt;Someone, please just tell me what test to run and how to populate the cells of the test.&lt;/P&gt;&lt;P&gt;Thank you in advance.&lt;/P&gt;&lt;P&gt;A. Cooper&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture.JPG" style="width: 421px;"&gt;&lt;img src="https://community.jmp.com/t5/image/serverpage/image-id/10803i87B099ADF66F0D1C/image-size/large?v=v2&amp;amp;px=999" role="button" title="Capture.JPG" alt="Capture.JPG" /&gt;&lt;/span&gt;&lt;/P&gt;</description>
      <pubDate>Tue, 22 May 2018 20:40:00 GMT</pubDate>
      <guid>https://community.jmp.com/t5/Discussions/Predicting-an-unknown-from-a-trend-line/m-p/57887#M32191</guid>
      <dc:creator>ACooper</dc:creator>
      <dc:date>2018-05-22T20:40:00Z</dc:date>
    </item>
    <item>
      <title>Re: Predicting an unknown from a trend line</title>
      <link>https://community.jmp.com/t5/Discussions/Predicting-an-unknown-from-a-trend-line/m-p/57942#M32217</link>
      <description>&lt;P&gt;This is not a statistical test. This task is fitting a model, and equation, and estimating the unknown from the model.&lt;/P&gt;&lt;OL&gt;&lt;LI&gt;See link &lt;A href="https://www.wikihow.com/Calculate-Molar-Absorptivity" target="_self"&gt;https://www.wikihow.com/Calculate-Molar-Absorptivity&lt;/A&gt;&lt;BR /&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;Abs = e*l*Conc or Conc = k*Abs where k = 1/(e*l)&lt;/LI&gt;&lt;LI&gt;Main Menu &amp;gt;Analyze&amp;gt;&lt;STRONG&gt;Fit Y by X&lt;/STRONG&gt;, specify Conc for &lt;STRONG&gt;Y&lt;/STRONG&gt; and Abs for &lt;STRONG&gt;X&lt;/STRONG&gt;, press &lt;STRONG&gt;OK&lt;/STRONG&gt;&lt;/LI&gt;&lt;LI&gt;Find the red menu icon above the graph, select &amp;gt; &lt;STRONG&gt;Fit Special&lt;/STRONG&gt;. Check the box next to &lt;STRONG&gt;Constrain the intercept to&lt;/STRONG&gt;&amp;nbsp;0 , press &lt;STRONG&gt;OK&lt;/STRONG&gt;&lt;/LI&gt;&lt;LI&gt;Find the red menu icon below the graph, select &amp;gt; &lt;STRONG&gt;Save Predicteds&lt;/STRONG&gt;. The table now has the predicted values [points on the line] and there is a value for the last row where Abs = 0.027&lt;/LI&gt;&lt;/OL&gt;&lt;P&gt;If this is a class assignment, this method might not be what is expected of you. [Read your class notes.]&amp;nbsp; I attached a JSL script, with comments (green text) that describe the point and click steps to customize the report.&lt;/P&gt;&lt;PRE&gt;&lt;CODE class=" language-jsl"&gt;Names Default to Here(1);

//create the table
dt = New Table( "Fit",
	Add Rows( 6 ),
	New Column( "Conc",
		Numeric,
		"Continuous",
		Format( "Best", 12 ),
		Set Values( [0, 0.2, 0.5, 1, 2, .] )
	),
	New Column( "Abs",
		Numeric,
		"Continuous",
		Format( "Best", 12 ),
		Set Values( [0, 0.011, 0.063, 0.112, 0.243, 0.027] )
	)
);

//See link https://www.wikihow.com/Calculate-Molar-Absorptivity
//Abs = e*l*Conc or Conc = k*Abs where k = 1/(e*l)

//

//draw the graph
fm = dt &amp;lt;&amp;lt;  Fit Y by X(
	Y( :Conc ),
	X( :Abs )
);

//From the red inverted triangle menu icon, select&amp;gt; Fit Special, then check 
//the box to Constarin Intercept to 0
fm &amp;lt;&amp;lt; Fit Special( Intercept( 0 ), {Line Color( {212, 73, 88} )} );

//From the red inverted triangle menu below the graph select &amp;gt; Save Predicteds
fm &amp;lt;&amp;lt; (Curve[1] &amp;lt;&amp;lt; Save Predicteds);

//Double click on the X-axis and check the boxes for Grid, Major and Minor
report(fm) [ScaleBox(1)] &amp;lt;&amp;lt;	{Label Row( {Show Major Grid( 1 ), Show Minor Grid( 1 )} )};

//Double click on the Y-axis and check the boxes for Grid, Major and Minor
report(fm) [ScaleBox(2)] &amp;lt;&amp;lt;	{Label Row( {Show Major Grid( 1 ), Show Minor Grid( 1 )} )};

//Double click on the X-axis again and in the lower box labeled Reference Lines
//enter 0.027, select a color and line style
report(fm) [ScaleBox(1)] &amp;lt;&amp;lt;	{Add Ref Line( 0.027, "Dotted", "Medium Dark Red", "", 2 )};

report(fm)[FrameBox(1)] &amp;lt;&amp;lt;	Add Text Annotation(
          Text( "Abs =0.027 \!N Pred Conc = 0.xxx" ),  //enter the predicted value 
		  Text Box( {85, 192, 199, 232} ),
		  Background Color( "Light Yellow" )
      );&lt;/CODE&gt;&lt;/PRE&gt;</description>
      <pubDate>Wed, 23 May 2018 10:59:25 GMT</pubDate>
      <guid>https://community.jmp.com/t5/Discussions/Predicting-an-unknown-from-a-trend-line/m-p/57942#M32217</guid>
      <dc:creator>gzmorgan0</dc:creator>
      <dc:date>2018-05-23T10:59:25Z</dc:date>
    </item>
    <item>
      <title>Re: Predicting an unknown from a trend line</title>
      <link>https://community.jmp.com/t5/Discussions/Predicting-an-unknown-from-a-trend-line/m-p/57959#M32230</link>
      <description>&lt;P&gt;A million thanks.&lt;/P&gt;&lt;P&gt;I never would have found all the right buttons to click on without your guidance.&lt;/P&gt;&lt;P&gt;Austin&amp;nbsp;&lt;/P&gt;</description>
      <pubDate>Wed, 23 May 2018 14:54:48 GMT</pubDate>
      <guid>https://community.jmp.com/t5/Discussions/Predicting-an-unknown-from-a-trend-line/m-p/57959#M32230</guid>
      <dc:creator>ACooper</dc:creator>
      <dc:date>2018-05-23T14:54:48Z</dc:date>
    </item>
    <item>
      <title>Re: Predicting an unknown from a trend line</title>
      <link>https://community.jmp.com/t5/Discussions/Predicting-an-unknown-from-a-trend-line/m-p/57965#M32234</link>
      <description>&lt;P&gt;This case is known as the &lt;EM&gt;calibration problem&lt;/EM&gt; or &lt;EM&gt;inverse prediction&lt;/EM&gt; in JMP. Select &lt;STRONG&gt;Analyze&lt;/STRONG&gt; &amp;gt; &lt;STRONG&gt;Fit Model&lt;/STRONG&gt;, put &lt;STRONG&gt;Abs&lt;/STRONG&gt; in the &lt;STRONG&gt;Y&lt;/STRONG&gt; role, add &lt;STRONG&gt;Conc&lt;/STRONG&gt; to &lt;STRONG&gt;Effects&lt;/STRONG&gt;, select &lt;STRONG&gt;No Intercept&lt;/STRONG&gt;,&amp;nbsp;and click &lt;STRONG&gt;Run&lt;/STRONG&gt;. Click the red triangle next to Fit Least Squares and select &lt;STRONG&gt;Estimates&lt;/STRONG&gt; &amp;gt; &lt;STRONG&gt;Inverse Prediction&lt;/STRONG&gt;. You can enter multiple Y values and specify the confidence intervals of interest. You will get a plot of the X values and a table of them, too.&lt;/P&gt;</description>
      <pubDate>Wed, 23 May 2018 15:47:00 GMT</pubDate>
      <guid>https://community.jmp.com/t5/Discussions/Predicting-an-unknown-from-a-trend-line/m-p/57965#M32234</guid>
      <dc:creator>Mark_Bailey</dc:creator>
      <dc:date>2018-05-23T15:47:00Z</dc:date>
    </item>
    <item>
      <title>Re: Predicting an unknown from a trend line</title>
      <link>https://community.jmp.com/t5/Discussions/Predicting-an-unknown-from-a-trend-line/m-p/58016#M32248</link>
      <description>&lt;P&gt;Thank you, Mark.&amp;nbsp; That was the reason for my comment about the method. I was expecting a reply, regarding the model.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;</description>
      <pubDate>Wed, 23 May 2018 20:54:05 GMT</pubDate>
      <guid>https://community.jmp.com/t5/Discussions/Predicting-an-unknown-from-a-trend-line/m-p/58016#M32248</guid>
      <dc:creator>gzmorgan0</dc:creator>
      <dc:date>2018-05-23T20:54:05Z</dc:date>
    </item>
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