$ sudo apt-get update
$ sudo apt-get install octave-data-smoothing 

octave-data-smoothing is installed in your system.

Make ensure the octave-data-smoothing package were installed using the commands given below,

$ sudo dpkg-query -l | grep octave-data-smoothing *

You will get with octave-data-smoothing package name, version, architecture and description in a table

octave-data-smoothing package basic information: