new_trader
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I don't think there's anything that tells you everything. Also I don't think many TA people would consider it wise to trade an instrument based solely on an average of instruments, unless it's the average you're trading. Sure if you are trading a stock you might look at the Dow for some overall trend, but you're going to need to look at the stock itself. And that's just when there are 30 components in the average. How many components are there in the housing average? Think it would be nuts to make a judgement on one individual house from just that.
And then there are other issues such as liquidity, transaction costs etc, and the fact that not everything about a house is contained in its value or even its relative value to other houses, i.e. your personal utility.
The difference is that it is possible for the average investor to pick one stock that outperforms the stock market averages. What are the chances they could do the same with a house? So, despite minor cosmetic differences, it would be fair to say that if the price of the house you own doubles, chances are, almost every other house has doubled in value as well. I know it's human nature for a person to think that their house is worth much more than their neighbours house, but it is rarely the case.