The following table from the RBA’s latest statement of monetary policy shows that the RP Data-Rismark hedonic index has the most conservative estimates of house price growth in the year-to-date (note that this is the quarterly index, not the monthly iteration). RP Data-Rismark also showed lower peak-to-trough losses in 2008 than the ABS or APM. Over and above the inherent compositional biases that afflict median price indices, they also cannot control for capital expenditure on assets or changes in housing quality over time. This likely explains why the RP Data-Rismark hedonic index gives consistently more conservative estimates of price (positive or negative) change.
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