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1. There are no absolute values for anything, it all depends on how, when, where and what you use to measure something with. Thus, the time, weather, equipment and even person doing the measuring can and will create measurement errors and bias.

2. The only real "value" for anything is a composite of values which create a bell shaped curve, wherein we assume "True Value" can be found. The standard deviation is a measure of the range in which we can expect our "true value" to be found. The SD is a number that is based on some statistical probability and itself can be subject to error. In other words, it can be wrong.

3. The "real value" of horsepower for a bike will depend on many factors on any given day: Temperature, humidity, type of gas used, altitude, not to mention the tuning of the bike.

4. If we use the principle that economists use: "Ceteris Parebus" than we will find that some bikes are more powerful than others, but think of this as possible along a bell shaped curve and with the power bands so close between bikes, it is highly likely that there will be Gixxers more powerful than Kawis, Kawis more powerful than CBR's, CBR;s more powerful than R1s and R1s more powerful than Gixxers and so on an so forth. Since the range of "true values" for hp for these bikes will very likely overlap. My R1 will make more hp than some Kawi's and less than others. Again, I am invoking the principle of Ceteris Parebus.

5. Another factor is the error of the dyno's. Just as any survey has a range of error and we expect the true value to lie somewhere in this range, we need to ask, what is the calibration error of the instrument we are using, i.e, how accurate is it? I have not seen one dyno posting with this figure and yet it is critical as well as asking what is the range of error, since the error itself could vary from one dyno test to another even on the same dyno, not to mention other dyno's. By the way, a good question if you decide to fight a speeding ticket as I did a few years ago. I made them give me the calibration records and testing records for both the radar and the cop using the radar. My defense would have put Perry Mason to shame. I had the cop looking like he could'nt spell his name. Nevertheless, I still lost the case. Moral: Can;'t beat the system.

Hope this helps but I doubt it.