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+--- Thread: One line PredY ? Statistics 2Var (/thread-16715.html)
One line PredY ? Statistics 2Var - Schraf - 04-21-2021 05:21 PM
Hello.
No problem finding the value of y using the method below:
C1:={750,850} --> x1 and x2
C2:={55,65} --> y1 and y2
Predict y3 knowing x3=813.7 :
PredY(813.7) --> 61.37 (linear regression)
It's also ok when I use the data columns in Statistics 2Var App.
But in the documentation we can read: PredY(mode, x, parameters)
mode = 1 for linear regression (OK ?)
x = 813.7 (OK ?)
parameters ?? I try {{750,850},{55,65}} or the slope and Y-intercept but it does not work.
Do you have an idea ?
RE: One line PredY ? Statistics 2Var - roadrunner - 04-21-2021 10:44 PM
If you are not in the spreadsheet app type it like this:
Spreadsheet.PredY(1,X,{slope,intercept})
-road
RE: One line PredY ? Statistics 2Var - Wes Loewer - 04-22-2021 04:36 AM
Just to clarify, there are two different PredY functions.
Statistics_2Var.PredY() which appears to only take 1 X parameter and uses the fit type selected in Symb screen.
Spreadsheet.PredY() which takes the 3 parameters that you were trying to use.
RE: One line PredY ? Statistics 2Var - Schraf - 04-22-2021 07:00 AM
I understand my mistake, there were several functions PredY...
Thanks
RE: One line PredY ? Statistics 2Var - jonmoore - 04-22-2021 12:21 PM
(04-22-2021 04:36 AM)Wes Loewer Wrote: Just to clarify, there are two different PredY functions.
Statistics_2Var.PredY() which appears to only take 1 X parameter and uses the fit type selected in Symb screen.
Spreadsheet.PredY() which takes the 3 parameters that you were trying to use.
I think this is one of those areas where the interactive help cards could be improved by including the Statistics and Spreadsheet prepend details. A very simple change but the clarity will be greatly improved.