Intertia of cluster models

[Aslan]

Hello,

In the cluster kmeans results inertia is not true. 

For example:

- Kmeans model, k=8, intertia is 1.0e+6

- Kmeans model, k=9, intertia is 9.6e+5

I think inertia must decrease when k increase.

[HarizoR]

Hi Aslan,

You are correct, inertia usually decreases when the number of clusters k increases! And the results you show actually back up this claim, since:

k	inertia
8	1e+6 = 1,000,000
9	9.6e+5 = 960,000

Hope this helps!

Best,

Harizo

[Aslan]

Thanks HarizoR.

it is my mistake