Percent agreement is a statistical term used in the Six Sigma methodology to measure the degree of agreement between two or more independent observations or measurements. In essence, it is a measure of how closely the observations match each other, expressed as a percentage.

Percent agreement is a relatively simple measurement, and it is often used when there are only two possible outcomes to a given observation, such as “yes” or “no,” “pass” or “fail,” or “in-spec” or “out-of-spec.” However, it can also be used when there are multiple possible outcomes, such as when using a Likert scale to measure attitudes or opinions.

To calculate percent agreement, you first need to determine the total number of observations or measurements that were taken. Then, you need to determine how many times the observers or measurers agreed. Finally, you divide the number of agreements by the total number of observations and multiply by 100 to get the percentage.

For example, if ten people were asked to rate a product on a five-point scale, and seven of them gave the product a rating of four or five, then the percent agreement would be 70 percent. Likewise, if two people were asked to inspect a batch of 100 parts and agreed on the quality of 98 of them, then the percent agreement would be 98 percent.

Percent agreement is a useful tool in Six Sigma because it provides a way to measure the degree of agreement between independent observers or measurers. This can be useful for identifying areas where there may be inconsistencies or biases in the observations, or for measuring the effectiveness of a process improvement initiative.

However, it is important to keep in mind that percent agreement only measures the degree of agreement between the observations, and does not take into account the actual accuracy of the measurements. For this reason, it is often used in conjunction with other statistical measures, such as the kappa statistic, which takes into account the probability of agreement by chance.

In conclusion, percent agreement is a simple but effective measure of agreement between independent observations or measurements. By using this tool in conjunction with other statistical measures, Six Sigma practitioners can gain a better understanding of the accuracy and consistency of their observations, and make data-driven decisions to improve their processes and outcomes.