I need a formula or equation for determining par stock levels. I sell three re-supply products most commonly replaced every 3 or every 6 months. I know what qty I shipped of each during each of the past six months AND I know how many new customers were established six months ago and three months ago. I can assume a 50% compliance rate among 6-month old customers and a 25% compliance rate among 3-month old customers. With all this info, I should be able to project my stock needs for the next month & determine the qty of each product to have on hand--how do I do that?
Keywords: economics, equation, formula, par stock levels