Timeline for Fitting exponential decay with negative y values
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Dec 15, 2017 at 11:44 | comment | added | Mikko | The problem often takes place when water is very clear (oceanic water). Some values become below zero. I think we have an instrument that suffers from temperature problems. When it overheats, the values become unstable, but these details should probably not be handled in Crossvalidated. | |
| Dec 15, 2017 at 11:12 | comment | added | Roland | @Mikko If you measure absorption and the asymptote gets significantly zero, I would say that you have problems with your calibration or instrument stability. | |
| Dec 15, 2017 at 10:37 | comment | added | Mikko |
Perfect. I did not know about SSasymp function. Thank you! I believe the researchers want to refer to the article I cited in the question and use the K term, but I will suggest them to modify their equation. I think they want to keep the K, because negative values mean that the instrument did not behave as expected, but they are interested in the slope. Removing the negative asymptote might affect the slope in some instances.
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| Dec 15, 2017 at 10:34 | vote | accept | Mikko | ||
| Dec 15, 2017 at 10:08 | history | edited | Roland | CC BY-SA 3.0 |
added 374 characters in body
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| Dec 15, 2017 at 10:02 | history | answered | Roland | CC BY-SA 3.0 |