N-Index

This program allows calculating the minimum size of a sample, when knowing the coefficient of variation wanted.

To calculate the minimum size of the sample with N-Index, you have to:

• Indicate the number of classes of your index.
• Fill in a table by indicating for each class the coefficient and the frequency of the observations.
• Indicate the coefficient of variation targeted

By clicking on the “get sample size" button, you will obtain the value of the minimum size of the sample.