Apdex Levels group users into categories of satisfaction with the response time of web applications and services. These levels are defined as satisfied, tolerating or frustrated depending on their response time in comparison to a threshold.

Apdex Score is a measure of users' satisfaction with the response time of web applications or services. The Apdex Score is a value between 0 and 1, calculated based on three Apdex Score levels of user satisfaction: frustrated, tolerating, or satisfied.

Average Basket Size (ABS) is an e-commerce metric that tracks the average number of items sold per transaction. In other words, ABS measures the increase or decrease in the quantity of items purchased per transaction. It can also be used to calculate the Average Basket Value, which is the average cost of units placed in the basket.

Average Length of Stay is a key healthcare industry indicator. Monitoring this metric will help you determine where and when to make changes to improve efficiency. It can vary depending on the type of facility and treatments offered at the facility. It is typically measured in days where partial days are rounded up to the next full day.

Average Order Value (AOV) indicates the average amount of money spent on an order, either over a set period or over the lifetime of an e-commerce store. This is calculated by taking the total revenue and dividing it by the number of orders placed within the determined period.

Average Purchase Frequency counts the average number of transactions per customer per period. This metric is used to better understand customer behavior and purchase patterns.

Average Revenue Per Account (ARPA) is the average revenue generated per account per year or month. It is used as an indication of revenue generation capability and the ability to meet targets.

Average Revenue Per User (ARPU) is a company's generated revenue that is averaged across all users and reported as a monthly or yearly value. ARPU is a top-level metric, that can easily be normalized and is often cited as a comparative measure between similar companies.

Average Selling Price (ASP) is the average price a given product is sold for. This metric can be applied narrowly to a product or service or, more broadly, to an entire market. It's a common metric, often used to compare businesses or channels and is particularly interesting as a reflection of what consumers will pay for similar products or services.

Average Server Response Time is the average amount of time an application’s web server takes to return the results of a request to the user. It is affected by several factors including network bandwidth, number of users, and number and type of requests submitted.

Average Session Duration measures the average amount of time spent per session on your website. It is calculated by dividing total time spent across sessions by the total number of sessions.

Average Speed to Answer (ASA) is the average amount of time taken for a call centre agent to answer an inbound customer call, including time spent waiting in a queue. It excludes time spent navigating an IVR system. This metric one of the most important signals tied to customer satisfaction.