How do you find K in K means clustering?

Related questions

1. Which are two types of hierarchical clustering?
2. What measure how far the predictions are from the actual values in machine learning?
3. What is K means algorithm in data mining?
4. Why is K means clustering used?
5. How does agglomerative clustering work?
6. What are the applications of K means clustering?
7. What is Kmeans R?
8. Why K means unsupervised?
9. What is clustering and its types?
10. What is the difference between K means and hierarchical clustering?

Tags

1. #calculate
2. #square
3. #location
4. #considered
5. #appropriate
6. #total
7. #clusters
8. #curve
9. #number
10. #within
11. #generally
12. #cluster
13. #instance
14. #according
15. #varying
16. #indicator