navigation map

  1: Introduction
  2: Simple example
  3: Invocation
  4: Finer Control
  5: X-Y Plots
  6: Contour Plots
  7: Image Plots
  8: Examples
  9: Gri Commands
  10: Programming
  11: Environment
  12: Emacs Mode
  13: History
  14: Installation
  15: Gri Bugs
  16: Test Suite
  17: Gri in Press
  18: Acknowledgments
  19: License

index.html#Top ListOfGriCommands.html#ListOfGriCommands Gri: Read commands Gri: `reorder' command index.html#Top Gri: `reorder' command

9.3.34: `regress'

`regress {y vs x [linear]}|{x vs y [linear]}'

Perform linear regression of `y' as a function of `x' or `x' as a function of `y'.

  • `regress y vs x' Linear regression of y vs x. Several quantities are reported and also saved into builtin variables. The intercept is defined as `..coeff0..', its 95 percent confidence limit is defined as `..coeff0_sig..'. Thus the confidence range is `..coeff0..-..coeff0_sig..' to `..coeff0..+..coeff0_sig..'. Similarly the slope and confidence limit are stored in `..coeff1..' and `..coeff1_sig..'

    The squared correlation coefficient is stored in `..R2..'.

    Historical note prior to version 2.1.15, a different meaning was attached to `..coeff0_sig..' and `..coeff1_sig..'; they used be defined as standard errors, without having been multiplied by the appropriate student-t coefficient.

  • `regress x vs y' Linear regression of x vs y; for notation see above.

  • `regress y vs x linear' Linear regression of y vs x; for notation see above.

  • `regress x vs y linear' Linear regression of x vs y; for notation see above.

navigation map