No, I don't think that it is. I think that you are asking to constrain the intercept to zero. For more complex modelling options like this, you need to use Fit Y by X from the Analyze menu. From the red triangle menu for Bivariate Fit you can select Fit Special... and then you can select Constrain Intercept to 0:
Hm, I was searching for a one-click solution to get a "1:1" correlation line *) into the Graph Builder Plot, one which goes through 0/0 and runs close to the data points **) - I guess I will write a script which just calculates the center of gravity and draws the line.
*) edit: along the idea: - 0 % -> 0% - 100% -> 100% For all the cases where it's 100% clear that X and Y correlate without offset,
like a conversion of scales: any jitter around the line can just be a measurement artifact (either on the X or Y axis - or on both).
**) By the way - actually I thought that a fit with constrained Y intercept goes somewhere close to the center of gravity: no freedom for the Intercept, 1 degree of freedom to get close to the data points.
I was a bit surprised to see (red line: y not constrained, green line y=0)
So, calculating the center of gravity and drawing the line seems to be the better approach for what I want to do ...
Created:
Mar 29, 2023 12:18 PM
| Last Modified: Mar 29, 2023 9:18 AM(1085 views)
| Posted in reply to message from hogi 03-29-2023
When you say ""1:1" correlation line", do you want a 45-degree line i.e. y=x : if so, you can do that in Graph Builder
right-click> customise> add a script using the Y Function template and set the function of x as x:
Y Function(x, x);
(ok, not a "one-click" solution, but very effective if you want a reference line for a calibration curve, or a reference line for actual versus predicted)
Let's say X is measured in cm and Y is measured in inch. Same holds for measurements of the same property at different tools - or at different times during production process. (if I knowthat 0 is measured as 0)
Created:
Mar 29, 2023 01:54 PM
| Last Modified: Mar 29, 2023 10:54 AM(1076 views)
| Posted in reply to message from hogi 03-29-2023
You can create a new variable inside the platform with a formula equal to the x variable (right click on x variable, formula,, and okay), then add that as a y variable and draw a function element on the chart. Remove that from the other graph elements and only select the transformed variable in the function. It does take a few clicks and necessitates custom y axis and chart labels:
Created:
Mar 30, 2023 05:23 AM
| Last Modified: Mar 30, 2023 2:23 AM(1054 views)
| Posted in reply to message from hogi 03-29-2023
Argh, I just thought again - and remembered a wonderful micro-"lecture" that @julian gave in the DataViz breakout room at Discovery Summit Europe 2023 - how easy you can solve puzzles with regression - by showing the squared residuals in the plot via
After dragging the points and lines one can sees that my puzzles with the constrained fit were actually the ordinary thing with fit outliers - and the squared weighting of the residuals - and a fit line which definitely doesn't hit the center of gravity:
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