What is Guest Factor calculation?
Currently the guest factor in PMI is calculated on same month last year, adjusted to equivalent weekdays. There might be significant changes in the guest factor during a month, e.g. December which for many properties have primarily business guests in the beginning of the month and leisure in the end, and it is therefore not adequate to consider an entire month to be coherent. The guest factor should therefore be based upon seasons instead of calendar month.
For more information see https://qna.d2o.com/knowledge-base/guest-factor-calculation-2