mostly copied from google because they word it better than me :)
"Revenue per available room (RevPAR) is a performance measure used in the hospitality industry. RevPAR is calculated by multiplying a Unit average daily room rate by its occupancy rate. RevPAR is also calculated by dividing total room revenue by the total number of rooms available in the period being measured."
For single family houses, RevPar= Average Daily Rate x Occupancy Rate.
Example: High ADR but Low RevPar means that you booked at high rates, but your occupancy was low.
I would also suggest that you allow for grouping of the numbers... multiple properties in the analysis, everything in a specific city, an entire lodge or inn, etc. etc. etc...