SHANE’S FORMULA HAS FOUR PARTS:
STAGE ONE: Discount all replacement caps by 75 per cent.
STAGE TWO: Determine how many tests available over career.
STAGE THREE: Divide average number of tests per season during career period by 12.5, which is the average number of tests per season during the professional period. This figure is known as era-adjusted factor.
STAGE FOUR: Multiply era-adjusted factor by actual number of caps.