Use this to save results from a Response Surface in Genstat data structures when the **Spline** model is being used. After selecting the appropriate boxes, type the names for the identifiers of the data structures into the corresponding **In**: fields.

## Save

X values at extreme point |
Variate | The x-values at the extreme point for the spline model |

Standard errors of x values at extreme point |
Variate | The standard errors of the x-values at the extreme point for the spline model |

Y value at extreme point |
Scalar | The estimated y-value at the extreme point for the spline model |

Standard error of y value at extreme point |
Scalar | The standard error of the y-value at the extreme point for the spline model |

Exit code |
Scalar | The exit code from the VSURFACE procedure. If this is zero the model fitting and any bootstrapping have been successful |

Predictions at given levels of x |
Matrix | The estimated y-values at the prediction levels for the x-values |

## Display in spreadsheet

Select this to display the results in a new spreadsheet windows.

## Save predictions in a list

When saving Predictions at given levels of x, if this is selected the predictions will be saved in 3 columns giving the X1 and X2 prediction levels and then the estimated y values. The predicted values at the observed data points are also included in the first rows, followed by the prediction levels on the grid of x-levels. If this is not selected, the predictions will be returned in a matrix with the columns being giving the X2 levels and rows the X1 levels.