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Custom Error Bars Using the Graph Builder

I love the graph builder, but there is one type of analysis that should be easy, but alas is not. I can easily use the graph builder to add 1 standard deviation error bars, but I am doing some regulatory work that requires 3 standard deviation error bars. It sure would be nice if I could adjust that with a drop down menu. Do you all know of an easy fix for that?

 

Thank you,

BioMike

Re: Custom Error Bars Using the Graph Builder

I do not see an option that will allow you to change the STD for the error bars, however, if you standardize the Y variable to where the mean is equal to the current mean, but the STD is 3 times the size of the current STD, then you will get the chart you want.  Below is an example showing the use of a Transform formula to show you what I am talking about

Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
Graph Builder(
 Variables(
  X( :sex ),
  Y( :weight ),
  Y(
   Transform Column(
    "Transform[weight]",
    Formula(
     inSTDs = Abs( :weight - Col Mean( :weight, :sex ) ) /
     Col Std Dev( :weight, :sex );
     If( :weight >= Col Mean( :weight, :sex ),
      Col Mean( :weight, :sex ) + 3 * inSTDs *
      Col Std Dev( :weight, :sex ),
      Col Mean( :weight, :sex ) - 3 * inSTDs *
      Col Std Dev( :weight, :sex )
     );
    )
   ),
   Position( 1 )
  )
 ),
 Elements(
  Line(
   X,
   Y( 1 ),
   Y( 2 ),
   Legend( 4 ),
   Error Bars( "Standard Deviation" )
  )
 )
);