Hello Rosalie,
First of all, thank you very much for this great tool!
I wonder what you'd recommend to do when there are negative values of excess 210Pb in the profile. Because excess 210Pb is a calculated value from two measurements, which both have some uncertainty connected to them, it's only natural when the values close to the base of the core, where no or little excess is present, tend to be distributed on both sides of 0. I think ignoring these values introduces a bias.
Could a model with a fixed offset be used to avoid negatives, when the linearized fit (using log values) is used?
Or a non-linear fit on original values, which could directly deal with negative?
Cheers!
Dana
Hello Rosalie,
First of all, thank you very much for this great tool!
I wonder what you'd recommend to do when there are negative values of excess 210Pb in the profile. Because excess 210Pb is a calculated value from two measurements, which both have some uncertainty connected to them, it's only natural when the values close to the base of the core, where no or little excess is present, tend to be distributed on both sides of 0. I think ignoring these values introduces a bias.
Could a model with a fixed offset be used to avoid negatives, when the linearized fit (using log values) is used?
Or a non-linear fit on original values, which could directly deal with negative?
Cheers!
Dana