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- Script to Save Residuals of Spline Fit

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A week ago
(175 views)

Hello,

Anyone knows how to write a script to sava residuals (or predicteds) as a new colum for spline fit? It is easy if i do it manually, just need to select Save Residuals in the dropdown red triangle. I know how to write scripts to save residuals as a new column for liner fit using Fit Model. However, I often need to fit time-trend data using standardized x spline fit, and i am not sure if there's a easier way to do so. My final goal is to aquire residuals or predicteds for several varialbles in a loop, so a simple script will help a lot.

Thanks!!

8 REPLIES

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A week ago
(173 views)

You can find these types of syntax in the Scripting Index

Help==>Scripting Index==>Bivariate==>Bivariate Curve

Here is the scripting index example from that entry

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
obj = Bivariate(
Y( :Weight ),
X( :Height ),
Fit Polynomial( 3 )
);
obj << (Curve[1] << Save Residuals);
```

Jim

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A week ago
(153 views)

Thanks Jim! It works. If I need to add "GroupBy" in Bivariate is it posible to save all the residuals? It looks like JMP only keeps the last fit line. Thanks!

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
obj = Bivariate(
Y( :Weight ),
X( :Height ),
```

GroupBy( :Team),
Fit Spline( 0.1, Standardized )
);
obj << (Curve[1] << Save Residuals);

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A week ago
(144 views)

Each separate "Fit" that is specified has to have their residuals saved separately. The substript on the "Curve[]" reference is what handles this. The example below has a GroupBy(:Sex) which will produce a Fit for Females, "F" and one for Males, "M". Thus, 2 "Save Residuals" must be issued.

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
obj = Bivariate(
Y( :Weight ),
X( :Height ),
GroupBy( :sex),
Fit Spline( 0.1, Standardized )
);
obj << (Curve[1] << Save Residuals);
obj << (Curve[2] << Save Residuals);
```

As I was testing out this code for your example. I discovered that JMP 14 does not work for the Save Residuals for a Spline Fit. I will be passing that on to JMP Support as a bug.

Jim

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A week ago
(124 views)

Jim,

I noticed the same issue for JMP 14. JMP support states it is fixed in JMP 14.1 (August?).

Here is a small modification of Jim's script. It creates a single column of residuals. It uses the new (in JMP 13) syntax for multiple subsections of a data table. This is getting the residual columns by row and finding the max (actually it gets the only non-empty value).

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
obj = Bivariate(
Y( :Weight ),
X( :Height ), GroupBy( :sex),
Fit Spline( 0.1, Standardized )
);
//Find how many in a group. We know it is 2 for Big Class
summarize(_by = By(:sex));
//Find out how many columns before adding residuals
ncpre = ncol(dt);
_nby = nitems(_by);
for(i=1, i<=_nby, i++,
obj << (Curve[i] << Save Residuals);
wait(0);
);
idx = ncpre+1::(ncpre+_nby);
//create a single column of residuals
resids = dt << New Column("Weight v Height Spline Residuals",
Numeric, Continuous,
<< Set Each Value( max(dt[row(),idx]) )
);
```

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A week ago
(96 views)

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A week ago
(92 views)

I really like the new JMP 13 table subset reference. However, there still is an easy method to get the values with message Get as Matrix. The key syntax is dt << get as matrix( list | index ). There is no rowwise max function, but there is VMax function which is a columnwise max. I tested this in JMP 12.

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
obj = Bivariate(
Y( :Weight ),
X( :Height ), GroupBy( :sex),
Fit Spline( 0.1, Standardized )
);
//Find how many in a group. We know it is 2 for Big Class
summarize(_by = By(:sex));
//Find out how many columns before adding residuals
ncpre = ncol(dt);
_nby = nitems(_by);
for(i=1, i<=_nby, i++,
obj << (Curve[i] << Save Residuals);
wait(0);
);
idx = ncpre+1::(ncpre+_nby);
cmat = Transpose(VMax(Transpose(dt << get as matrix(idx)))); //matrix _nby x nrow(dt)
/*the previous line of code is performing these tasks
- get the columns of residuals into a matrix of size nrow(dt) x _nby
- create the transpose: coloumns are rows and rows are columns, size _nby x nrow(dt)
- Vmax is a vertical maximum, it finds the max of each column (previously rows)
returns a 1 x nrow(dt) vector, a row vector
- transpose again so it is a column vector
*/
//create a single column of residuals
resids = dt << New Column("Weight v Height Spline Residuals",
Numeric, Continuous, Values( cmat )
);
```

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Friday
(44 views)

Cool, this is awesome!!

Just one more question:

When I do ` obj << (Curve[i] << Save Residuals) `

and group by (:sex), JMP calculated residuals for "M" and "F" and saved in different columns with some empty cells. That's why "transpose" is needed to get all residuals in one column. However, if I do <<save Predicteds and group by (:sex), it actually calculates Predicteds for all Heights for both "M" and "F". I guess by default JMP does that even if I do it manually in the drop. Is there a way to claculate Predicteds for individual sex only?

Thanks

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Friday
(38 views)

Peng,

Yes, this seems inconsistent, however, I am guessing this is done on purpose to compare the predicteds (for example, the males are a hold-out set for the predicteds based upon females and vice versa.

To create a single column of Predicteds based upon the Group By model create a new column with a formula or set each value expression

If( :sex=="M", column for the male predicteds, :sex=="F", column for the male predicteds);

If you want a column that looks like the residual columns, then create a columnm for males and use an expression like

If( :sex=="M", column for the male predicteds, empty() );

Then do the same for females.