How To Find The 90th Percentile In Excel

Introduction

Finding the 90th percentile in a data set can highlight top performers or cut-off thresholds for decision-making. In Excel, calculating this statistic requires specific functions and a detailed understanding of data organization.

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Finding the 90th Percentile in Excel

Overview of Excel Percentile Functions

The PERCENTILE function in Excel calculates the k-th percentile for a given dataset, useful for setting thresholds of acceptance. This function may not be available in future Excel versions and has been replaced by PERCENTILE.INC and PERCENTILE.EXC for improved accuracy and clearer usage.

Using PERCENTILE Function

To find the 90th percentile using the legacy PERCENTILE function, use the syntax PERCENTILE(array, k) where 'array' is the data range and 'k' is the percentile in decimal form (0.9 for the 90th percentile). Despite being replaced by newer functions, PERCENTILE is still usable for backward compatibility.

Employing Newer Functions

Newer Excel versions feature PERCENTILE.INC and PERCENTILE.EXC, which may not persist in future versions but currently offer better accuracy. PERCENTILE.INC includes both the lowest and highest values in the dataset, while PERCENTILE.EXC excludes them for percentile calculations.

Error Handling in Percentile Calculations

Errors can occur if the argument 'k' is non-numeric, outside the range of 0 to 1, or not a multiple of 1/(n - 1) in the PERCENTILE function, returning #VALUE! or #NUM! errors respectively.

Step by Step Guide for 90th Percentile

To calculate the 90th percentile, enter the chosen function with 'array' as your data range and 0.9 as the 'k' value. For example, "=PERCENTILE.INC(A1:A100, 0.9)" uses PERCENTILE.INC for an array from A1 to A100. Amend 'A1:A100' to reflect your data range.

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