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sts66

10/11/17 11:43 AM

#116005 RE: HDGabor #115820

I could not stand further Nothing wrong with this scale ... I LMAO (anno) due to the fury on the board about this chart ... the answer is very simple ... the meaning (scale) of the x-axis:

Quote:Screening (Visit 1/Week -8 or Week -6) ... Visit 2 (Week -2) and Visit 3 (Week -1) ... Randomization Visit (Week 0) ... Post-Randomization Follow-up (Visit 5/Week 4, Visit 6/Week 11), Week 12 endpoint



You may be a business/accounting whiz, but your lack of math/engineering/science training is showing here - there is never, ever, a valid reason for have a non-linear x-axis in a chart except for one case that nobody but me here has ever heard of***, for the exact reason I pointed out - it shows a false trend. And the only types of valid y-axis are linear and log scale.


*** A Reciprocal Chart Axis Scale is sometimes used to plot certain thermophysical/chemical properties, like the Arrhenius equation, which shows the reaction rates between two materials, typically a metal and a fluid, with temperature (1/T) on the x-axis and the reaction rate using a log y-scale, chart shows a linear trend using two non-linear axis. For instance, in my old job I designed and built devices/systems using anhydrous ammonia and aluminum extrusions - add a tiny bit of water and you have a serious corrosion problem - while ammonia does not react with the always present aluminum oxide surface layer, it *does* react with pure aluminum if the oxide layer is cracked or erodes because water is present - it creates hydrogen gas that can cripple the device's function. The reaction rate of ammonia+water+aluminum is non-linear, increases with temperature, so you can "age test" a device by running it at an elevated temperature - for every 10 degrees C, the reaction rate doubles, so if it's expected operating temp is 20 C, running it at 100 C for one day will simulate 256 days of operation at 20 C. We'd usually run them for a week to simulate years of operation to ensure there were no contamination problems - ammonia is about the most corrosive fluid there is, reacts with damn near everything.