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Nov 24, 2011 7:58 AM
(1348 views)

How can I extract the slope and the intercept coming from a linear least squares model to a table variable? I want to use both values for additional calculations.

Thanks,

Helge

7 REPLIES

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Nov 24, 2011 2:36 PM
(549 views)

I assume you want a scripting solution. One way to do it is extract the numbers numbercolbox in the display tree that holds the parameter estimates. In the Fit Model report it is the first numeric column in the "Parameter Estimates" outline box. Below is an jsl example. I don't have access to JMP7, but it works in JMP9.

dt = Open**(** "$ENGLISH_SAMPLE_DATA/Big Class.jmp" **)**;

ls_fit = Fit Model**(**

Y**(** :weight **)**,

Effects**(** :height **)**,

Personality**(** Standard Least Squares **)**,

Emphasis**(** Effect Leverage **)**,

Run**(**

:weight << **{**Plot Actual by Predicted**(** **1** **)**, Plot Residual by Predicted**(** **1** **)**,

Plot Effect Leverage**(** **1** **)}**

**)**

**)**;

intercept = Report**(** ls_fit **)[**"Parameter Estimates"**][**Number Col Box**(** **1** **)][****1****]**;

slope = Report**(** ls_fit **)[**"Parameter Estimates"**][**Number Col Box**(** **1** **)][****2****]**;

dt << new table variable**(** "intercept", intercept **)**;

dt << new table variable**(** "slope", slope **)**;

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Nov 24, 2011 11:55 PM
(549 views)

Many thanks for this fast answer, but I fear that JMP7 does not support this kind of solution. I get this error message:

Can't subscript Display Box in access or evaluation of 'Subscript' , Report( ls_fit )["Parameter Estimates"]

I will have to update to the recent version.

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Nov 25, 2011 6:34 AM
(549 views)

Ok, maybe there has been som changes in the tree structure. But I don't think you woud have to upgrade only to solve this problem (altough JMP 9 is a compelling upgrade for other reasons).

Try to replace the lines for intercept and slope in the above code with:

intercept = Report**(** ls_fit **)[**Outline Box**(** "Parameter Estimates" **)][**Number Col Box**(** **1** **)][****1****]**;

slope = Report**(** ls_fit **)[**Outline Box**(** "Parameter Estimates" **)][**Number Col Box**(** **1** **)][****2****]**;

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Nov 25, 2011 7:37 AM
(549 views)

Unfortunately, this doesnt work neither.

Get the same error message as before:

Can't subscript Display Box in access or evaluation of 'Subscript', Report ( ls_fit) ["Parameter Estimates"]

[/*###*/"Parameter Estimates"][....

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Nov 25, 2011 10:06 AM
(549 views)

After including a

show properties (ls_fit)

into the script, it becomes clear from the output that the individual items in the report are not listed as scriptable.

The samples given in the current JMP scripting guide do not work either.

I therefore assume that version 7 is not able to access the values inside the Parameter Estimates. I have to install version 9.

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Nov 27, 2011 10:31 PM
(549 views)

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Nov 27, 2011 11:43 PM
(549 views)

Meanwhile I updated to JMP 9 and got my problem fixed. The script I use is:

//____________________________________________________________________

dt = currentDataTable ();

ls_fit = Bivariate(

Y( :Tau ),

X( :Name( "Concentration in g/mL" ) ),

Fit Line( {Line Color( "Red" )} ),

SendToReport( Dispatch( {}, "Bivar Plot", FrameBox, Frame Size( 250, 250 ) ) )

);

Intercept = Report( ls_fit )["Parameter Estimates"][Number Col Box ("Estimate")][1];

Slope = Report( ls_fit )["Parameter Estimates"][Number Col Box("Estimate")][2];

// The variables exist already in the table.

dt << set table variable( "Intercept", char (Intercept) );

dt << set table variable( "Slope", char (Slope) );

//_________________________________________________________________________

Thus, the first answer by MS was already the solution to my problem (except for the fact that I had to include the "char" statement).

Now I can use the slope and the intercept in a quite complicated equation to calculate automatically the parameter I want to have (particle size in this case).

Thanks to all who helped!