Insufficient information about jStat functions in the documentation

Question

While writing a JS application for performing a pairwise Tukey test, I encountered an issue with the function jStat.ttest()

I described my experience below.

However, in addition I would very much like to complain here about the lack of sufficient documentation (e.g. in the github of jStat), and anywhere online.

I tried to calculate the p-value, by the means of the function ttest(), like so:

var groupsKey = groups.map(item => item.key);
var groupsValue = groups.map(item => item.value.map(val => parseFloat(val)));

      // As you can see, I tried to convert the input data
      // Into array with float numbers
// and checked it if everything is correct

      console.log(groupsValue[0]);

// I used the nested loop construction for cycling into the groups

      for (let i = 0; i < groups.length; i++) {
        for (let j = i + 1; j < groups.length; j++) {
//assuming everything is correct, I loaded the input data into the function:
          let pValue = jStat.ttest(groupsValue[i], groupsValue[j], 2);

However, the result was always 'NaN'

It appears, that the best solution in this case would be to write the function for calculating the p-value from scratch. The other option is to search for other JS library, however, I already am using jStat, and chart.js so I am afraid I will load this project too much.

Are you sure ttest2() exists? The documentation only mentions ttest. Also, what values are you using? — VLAZ
– VLAZ, Commented Jan 24 at 12:54
Yes, I tried both ttest() and ttest2(). I will correct this. Moreover, there are at least three functions by the name ttest() with different inputs. But I do not know how to use them, since the documentation is insufficient. — Marko Kolaksazov
– Marko Kolaksazov, Commented Jan 24 at 13:03

Marko Kolaksazov · Accepted Answer · 2025-02-04 17:38:17Z

0

A working solution by the means of the jStat library can look like this:

let pValue = jStat.tukeyhsd(groupsValue[count]);

gives all p-values for the combinations between every experimental variant.

The input for this function groupsValue is a 2D array, containing the repetitions of every experimental variant (not the combinations between them, but only the groups).

Here is other demonstration, from the documentation of jStat:

> jStat.tukeyhsd([[1, 2], [3, 4, 5], [6], [7, 8]])
[ [ [ 0, 1 ], 0.10745283896120883 ],
  [ [ 0, 2 ], 0.04374051946838586 ],
  [ [ 0, 3 ], 0.007850804224287633 ],
  [ [ 1, 2 ], 0.32191548545694226 ],
  [ [ 1, 3 ], 0.03802747415485819 ],
  [ [ 2, 3 ], 0.5528665999257486 ] ]

the last number on each row is the p-value (for the combination of two of these groups).

answered Feb 4 at 17:38

Marko Kolaksazov

951 gold badge1 silver badge12 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Insufficient information about jStat functions in the documentation

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related