While I understand the idea that saying a guy is 70, but he could pass for 50 is a way of saying he is in better than average condition and can pass an appraisal test with effective age questions – I still find the wide variety of interpretation used in practice just as impractical for quantitative analysis as listing comp site sizes as “small” “medium” and “large.” "Small" and "effective age" both can mean ANYTHING. One guy's E/10 (on 50) is another guy's E/20 (on 100) and both may lead to the same adjustment.
I always wonder what is the appraiser’s assumed level of reinvestment. On commercial property one can use maintenance and reserve allowances to establish a nearly perpetual income stream. However, for houses reinvestment is not explicit. At one level of reinvestment effective age will be greater than actual in most eyes, at another level equal in most eyes and at another level effective age will be consistently lower in most eyes.
So Greg, how on earth could you expect to make sense out of it? One thing seems obvious, though. If you use effective age, how can you avoid adjusting for differences SOMEWHERE? I subject is E/10 and comp is E/100, there must be some difference somewhere.
Terry
Roger,
I always wonder what is the appraiser’s assumed level of reinvestment. On commercial property one can use maintenance and reserve allowances to establish a nearly perpetual income stream. However, for houses reinvestment is not explicit. At one level of reinvestment effective age will be greater than actual in most eyes, at another level equal in most eyes and at another level effective age will be consistently lower in most eyes.
So Greg, how on earth could you expect to make sense out of it? One thing seems obvious, though. If you use effective age, how can you avoid adjusting for differences SOMEWHERE? I subject is E/10 and comp is E/100, there must be some difference somewhere.
Terry
This is where it gets confusing. I think effective age IS conditions, as in the guy is 70 but his condition is that of a 50-year old. But when you use that formula that hinges on the cost-value ratio, effective age means something else entirely.Effective age can be as easily determined as condition. Both are more subjective that they are objective.
If you don’t get in the habit, you will have nothing to rethink. And besides, maybe 360-year life is accurage.357 yr total life!!! Maybe we had better rethink that.

Roger,
I am putting that one in my ‘plagiarize-early-and-often’ file.That whole battle over adjustments and allegedly extracting them from the market when such scant data is available is a proud tradition of appraisers, but is bogus. You are right to know it is generally indefensible since it is typically presented as if it were extracted from the market using a process that is repeatable and statistically significant