AFAIK you can just take the source data and apply your own weightings. For example, based on your own personal spending. Also, calculating inflation can be ver

AFAIK you can just take the source data and apply your own weightings. For example, based on your own personal spending. Also, calculating inflation can be very tricky. If every new iPhone costs the same, can you say that inflation = 0, or that there is deflation, since the same goods are now available at a lower price?