Enter the percentages of purchasing managers reporting better conditions, no change in conditions, a decrease in supplier deliveries, an increase in inventory levels, and an increase in employment into the calculator to determine the Purchasing Managers’ Index.

## Pma Formula

The following formula is used to calculate the Pma (Purchasing Managers’ Index).

Pma = (1.5 * PM) + (0.3 * NPO) + (0.15 * DL) + (0.15 * IS) + (0.3 * E)

Variables:

• Pma is the Purchasing Managers’ Index PM is the percentage of purchasing managers reporting better conditions than the previous month NPO is the percentage of purchasing managers reporting no change in conditions DL is the percentage of purchasing managers reporting a decrease in supplier deliveries IS is the percentage of purchasing managers reporting an increase in inventory levels E is the percentage of purchasing managers reporting an increase in employment

To calculate the Pma, multiply the percentage of purchasing managers reporting better conditions than the previous month by 1.5. Add this to the product of the percentage of purchasing managers reporting no change in conditions and 0.3. Add this to the product of the percentage of purchasing managers reporting a decrease in supplier deliveries and 0.15. Add this to the product of the percentage of purchasing managers reporting an increase in inventory levels and 0.15. Finally, add this to the product of the percentage of purchasing managers reporting an increase in employment and 0.3.

## What is a Pma?

A PMA (Premarket Approval) is a type of approval issued by the U.S. Food and Drug Administration (FDA) for certain types of medical devices. It is the FDA’s most stringent type of device marketing application and is required for devices that support or sustain human life, are of substantial importance in preventing impairment of human health, or which present a potential, unreasonable risk of illness or injury. The PMA process involves a thorough review and evaluation of the safety and effectiveness of the device.