Your assumption
--Next, I should be able to press VARS, move to Y-VARS, select FUNCTION,
then select Y-1 and automatically enter the equation into Y-1.-
is not correct.
When you press [STAT[>][CALC][4:LinReg(ax+b)] or any other regression model,the command echoes on the main screen. If you press [ENTER] at this point, the calculator uses by default lists L1 and L2 and displays the resulting equation without copying it in a Y-variable.
If you want to have the equation copied on a Y-function, you should modify the command as follows
LineReg(ax+b) [SHIFT][1: L1] [,] SHIFT[2:L2] [,] [VARS][>:Y-Vars] [1:Function][1:Y-1][ENTER].
Here, [>] stands for RightArrow. For any other regression model, use the appropriate command.
At this point, the command line should look like the following:
LinReg(ax+b) L1, L2, Y1
Press [ENTER] to calculate you get the same screen as when you do not save the equation in Y1, but if you go to the Y= editor or press GRAPH, you will see the regression line superposed on the scatter plot.
Thank you. Your method works. However, in the past, I was able to copy an equation to a Y function by pressing [VARS][>:Y-Vars] [1:Function][1:Y-1][ENTER] while the equation derived from L1, L2 was displayed on the screen. Is it possible that a default setting in the calculator has been changed?
No there is no default setting. I believe you are mistaken when you say you used to do it. Here is why. Try entering 3*X+3 [STO>] ...Y1 and ENTER. You get ERR:DATA TYPE.
When a result of a regression is still displayed, there are several data y, a, b. Which one gets stored in Y1? The results displayed are not on the command line, and cannot be stored in answer memory (ANS) because ANS hold just one number. Sorry if that does not answer your question.
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Could you tell us what the error message says?
The error says ERR:INVALID
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