Why this package installed by npm is not found

I am working on Debian Stable Linux which is updated and working very well.

I have installed a compute-pcorr package globally with following npm command:

$ sudo npm install compute-pcorr -g

It is listed with following npm command:

$  npm list -g --depth=0 
/usr/local/lib
├── compute-pcorr@1.0.0
└── ml-stat@1.3.3

I am now trying following code demo code from its homepage:

var pcorr = require( 'compute-pcorr@1.0.0' ); 

var x = [ 1, 2, 3, 4, 5 ]; 
var y = [ 5, 4, 3, 2, 1 ];

var mat = pcorr( x, y );
Console.log("Correlation Matrix: "+ mat)

However, when I run above code, I get error:

$ node compute_pcorr_usage.js 

internal/modules/cjs/loader.js:818
  throw err;
  ^

Error: Cannot find module 'compute-pcorr@1.0.0'

Following in code is also not working:

var pcorr = require( 'compute-pcorr' ); 

I also tried to reinstall package with following command, but error persists:

sudo npm install compute-pcorr -g --save

Where is the problem and how can it be solved?

This issue happens when the library is not installed locally.
Try installing locally in your directory with the command npm install compute-pcorr
There's no need of installing globally via -g