logic of time-depended drift correction

Allan_

Hi, iolite.

I have learned that Iolite software has so many regression models to correct the drift. e.g., When the standards are not homogeneous enough, the spline_linearfit is what I like to use. But I am curious about the logic behind them. Can you give an introduction or some other text to explain all the regression models? Besides, I want to use SSB method to correct the time drift, how can I achieve it?

Allan

Bence

Hi Allan,

I'm not sure what you mean by the logic behind them? Can you please give some more information about what you would like to know?

For SSB, you can just use the 'StepLinear' option to get the traditional SSB approach. Please check it in the Time Series View to ensure that it is what you were wanting.

-Bence

Allan_

Bence Hi Bence,

Thanks for your replying. Sorry for my vague expression. For the time drift correction, I want the know the detailed mathematical model or the calculation formula of these various regression models. And in my case, I tested 3 standards as a group, hence when I used the StepLinear, the only used standard is the last one or the first one. I want to use the weighted average of fractionation factors to represent one group standard. e.g., List: 3 zircon 91500 as standard, 8 zircon samples, 3 zircon 91500 as standard. And the weighted average of fractionation factors calculated by 3 zircon 91500 is the final fractionation factor to do the "SteptLinear" drift correction. Is there any way to achieve it?

-Allan

Allan_

Hi Bence,

-Allan

Bence

Hi Allan_

I think what you describe might be best achieved by linking your three standard measurements into one and using the step linear interpolation from there.

Please let me know how it goes.

Kind regards,
Bence

Allan_

Bence Hi

Thanks for your replying. How to link three standard measurements into one? I do not know how to do it.

For the time drift correction, the answer has been found in Paton et al., 2010 JAAS. Thanks for your attention.

Allan

Bence

While in Edit Mode for one selection (Shift Click), if you hover over another selection, you'll see a link symbol (shown below). If you click the symbol the selections will become linked and you'll see an orange box showing the extent of the linked selection. You can repeat the linking process with the third (or more) selection.