How to Calculate yield? what are the components of it?

YIELD means "return" - it can take many forms: Return On Investment (ROI), REVPAR for hotels (Revenue per Available Room), GOPPAR (Gross Operating Profit per Available Room), etc. It measures the optimisation of an asset, such as hotel inventory, airlines and can be extended to commercial theatre operations, cruise industry etc. where certain pre-requisites are there (advance reservation possible, market segmentation, price discrimination etc)