The IQV (Index of Qualitative Variation) Calculator allows you to calculate the IQV, a measure of variability in categorical data. This tool has both Basic and Advanced options for customized calculations. Use it to determine IQV based on your provided category data, responses, and percentages.

### Input Field Guide

Each field in this calculator has a specific purpose. Please refer to the table below to understand what each input field represents and how to use it effectively.

**Input Field** |
**Description** |
**Example** |

**Number of Categories** |
Total number of categories available. Used in calculating the IQV in the Basic calculator. |
**5** |

**Sum of All Squared Percentages** |
Sum of the squared percentages for each category. Enter this to calculate IQV in Basic mode. |
**8000** |

**IQV** |
Displays the calculated IQV value. Leave blank to calculate, or enter a value if using it as a known input. |
**Result only** |

**Total Number of Responses** |
Total number of responses considered for top categories. Used in the Advanced calculator. |
**500** |

**Number of Top Categories** |
Number of top categories being analyzed. It must be greater than one in the Advanced calculator. |
**3** |

**Sum of Top Categories’ Percentages** |
Sum of the percentages for the top categories. Used in calculating the adjusted IQV in Advanced mode. |
**150** |

**Adjusted IQV** |
Displays the adjusted IQV based on top categories. It’s calculated automatically in the Advanced calculator. |
**Result only** |

### Calculation Examples

Below are two examples that demonstrate the step-by-step calculations for IQV using both Basic and Advanced calculators.

**Example 1: Calculating IQV (Basic)**

**Step** |
**Calculation** |
**Result** |

**Number of Categories** |
**5** |
5 |

**Sum of All Squared Percentages** |
**8000** |
8000 |

**IQV Calculation** |
$\frac{5 \times (100^2 – 8000)}{100^2 \times (5 – 1)}$ |
0.5 |

**Example 2: Calculating Adjusted IQV (Advanced)**

**Step** |
**Calculation** |
**Result** |

**Total Number of Responses** |
**500** |
500 |

**Number of Top Categories** |
**3** |
3 |

**Sum of Top Categories’ Percentages** |
**150** |
150 |

**Adjusted IQV Calculation** |
$\frac{3 \times (100^2 – \left(\frac{150}{500} \times 100\right)^2)}{100^2 \times (3 – 1)}$ |
0.8 |

Use the **Calculate** button after entering values to see results. Press **Reset** to clear all fields for a new calculation.