Trying to plot residuals on the stat plot but the RESID option is missing from the list/names. How can I put this back on?

Clearing the memory erased the RESID list. You can recreate the list by calculating a simple regression.

If some of the lists are missing press the STAT button then select SetUpEditor and ENTER to restore all of them (without data, of course.)
If the statistical plots are turned OFF you can turn one of them back ON again. Press SHIFT Y1= to access STAT PLOTS. Press 4:Plots Off. A good habit to avoid problems. After you turn all plots OFF, you must turn one of them ON if you intend to draw statistical graphs. You can for example Turn Plot1 ON.

1. To do so Press SHIFT Y1=, select say 1:Plot 1 ENTER.
2. Highlight ON and press ENTER.
   
3. Press DownArrow to move to line TYPE
4. Then you can set the plot type. You have 6 choices. Use the left/Right arrows to select one of the 6. The selected plot type icon will remain highlighted when cursor is moved.
5. Use DownArrow to move to XLIST line and select the x-values LIST. etc.
6. When finished Press 2nd QUIT to exit the stat plts configuration settings.

One statistical value that may be of interest to you is the R, R^2 coefficients. To have it displayed (if the regression model has it), you must set DiagnosticsON.

Press SHIFT 0 to enter catalog. Press x^-1 key to jump to the first command that starts with D.
Scroll down to reach DiagnosticsON, highlight it and press ENTER then ENTER.

You are trying to perform an operation that references one or more lists or matrices whose dimensions do not match. For example, trying to multiply a five-element list by a two-element list will produce this error because the number of elements in the lists do not match.

If you're getting this while trying to graph a function, it's probably because the calculator is expecting stat plot features. You can correct this by turning off the stat plot features. Press "2ND" "STAT PLOT" and then select 4:PlotsOff.

You're probably trying to graph a function that does not involve stat plot features. You can correct this by turning off the stat plot features. Press "2ND" "STAT PLOT" and then select 4:PlotsOff.

If you are doing a stat plot (plotting data in two lists), make sure the lists are of the same size.

To make a plot, first you will need to define a list. To do this, press "{", then enter the values of your list, separating each value with a comma, and ending the list with "}" then store (STO>) the list into a list variable ("2nd" + "1", "2", etc.). For a box plot, you will need only one list, and for a scatter plot, you will need two. One for the independent variable, and one for the response variable; that is, one for the X and Y axis, respectively. To make your plot, open the plot menu ("2nd" + "Y=") and select a plot. From there, you may select the type of plot and which lists to use as values.

To find the residuals for the line of best fit, from the home screen, press "STAT", then move one right to "CALC", then select option 4, "LinReg(ax+b)". Once this command is on your home screen, follow it with your X and Y axis lists, separated by a comma, eg: "LinReg(ax+b) L1, L2". Press enter. In a moment, you will be provided with 'a' and 'b' values. Plug those residuals into your "Y=" menu in the form "ax+b", replacing 'a' and 'b' with the residuals, and the line of best fit will be drawn across your graph.

You're probably trying to graph a function that does not involve stat plot features. You can correct this by turning off the stat plot features.

Press GRAPH F1 to enter the equation editor.

Plot1 Plot2 Plot3 on the top line of the equation editor displays the on/off status of each stat plot. When a plot name is highlighted, the plot is on. To toggle the status, press up, left, and right to place the cursor on the name, then press ENTER.

To turn on the residuals, you must turn diagnostics on.

Press 2nd then zero. You are now in an alphabetical catalog list. Go to the d's in the list highlight "diagnostic on" and press enter. This will take you back to the home screen. You must press enter and get the word "done" on the home screen.

If you are trying to get the residuals in a list, you must calculate a regression first. Then when you press 2nd stat, resid should be in that menu.

Simple, just check that the lists on the Stat Plot are the same as the ones that you are using.

This is a pretty vague problem but not much of a problem. Your actualy plotting device of your stat plot is under your "y=". But before you do that you need to hit the stat button right next to the blue apps button. Then hit edit. These are your stat data. If you are trying to add data in you should notice what list they are under. (top of the screen L1, L2, ect.) You should also make sure that the number of data adds up for your two list. Now that you have done that you can go to "2nd" then hit "y=". If you don't want to graph your stat plots just make sure they all sat plot... off by hitting enter on the one that says that it is on. Now if you want one on hit enter and make sure your lists from your data match up with your stat plot. You can hit enter and see what one you need. they are above the 1, 2, 3, etc key. Hope this works. If all else fails you can clear your calculator by pressing "2nd", "+", "7", "1", "2". This will turn off all your stat plots if you have trouble understandsing this. But most importnat make sure your L1 and L2 match up on your stat plot with your list under your stat edit. If you don't understand this just i can help you out some more