How to overlay 2 CDF curves into one single plot using JSL script?

Question

Hi

I would like to put more than one CDF plot in to a single curve.  I can do it under distribution/cdf tool to get a CDF curve, then by manually copy and paste the frame content from one to another curve.  Is there a way that I can do it using script?

Kelvin

Mark_Bailey · Answer

These plots are also available in Life Distribution using the Compare Groups tab in the launch diagram. Here is the same example as @txnelson used. The weight variable is not time-to-event, but you can still fit a variety of distribution models including the normal distribution used here.

txnelson · Answer

The way I believe you want to go, is to use Fit Y by X, Oneway, and specifying the CDF plot there.

In the above example, the Variable Sex is used as the X Factor, and Height as the Y.  If you need to plot two or more separate columns, then the approach you can take is to simply stack the columns using

Tables=>Stack

and then use the Label variable as the X Factor, and the Data Column as the Y.

Here is the sample script for the latter:

Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/big class.jmp" );

dtStack = dt << Stack(
	columns( :height, :weight ),
	Source Label Column( "Label" ),
	Stacked Data Column( "Data" )
);

dtStack << Oneway( Y( :Data ), X( :Label ), All Graphs( 0 ), CDF Plot( 1 ) );