Question about Texas Instruments TI-84 Plus Calculator
Your question is a very interesting one and I believe people will benefit from a complete solution to it. So I will provide a solution but I will apply it to a quadratic regression.
The points I will represent are those on a parabola
As you can see, I am cheating (no experimental points will fit a perfect parabola) but this will have no incidence on what I am going to show you.
1. PREPARE THE GRAPH FORMAT (you will see why latter)
With the calculator turned On, press [2nd][ZOOM] to access the (FORMAT) screen. Notice that RectGC is highlighted. It means that the coordinates are rectangular. IF the POLARGC had been highlighted and you had used the TRACE function the values of the coordinates of the points being traced would be in the form (R, theta), in other words polar coordinates.
2. ENTER THE DATA
Press STAT, then under the EDIT menu press [1:Edit]
to open the list editing screen. Ehow do i find and use the regression capabilties - d10bb96.jpgements of the two lists
After you enter the data in L1 and L1, Press [2nd][Y=] to open the (STAT PLOT)
3. CONFIGURE THE STAT PLOT TYPE
Initially the Plot1 may be OFF. Make sure at the beginning that all Stat Plots are OFF. If necessary press [4:PlotsOff] execute the command in Main calculator how do i find and use the regression capabilties - d653a12.jpgpress [2nd][Y=1] to get back at the stat plot screen configuration below
Press 1:Plot1 Off to open the P1 configuration
The cursor will be blinking on On. If not use cursor to highlight ON and press [ENTER]. The cursor will move to second line (TYPE), on first icon. Since you want to do a scatter PLOT that is the one to choose. Highlight it and press ENTER then move cursor with Down arrow to move to XList
If your data is in L1 and how do i find and use the regression capabilties - e825b96.jpgd Ylist will be already selected. If you have entered your data in some other lists, enter the proper lists (L3,L4, etc.)
DRAWING THE SCATTER PLOT
Now you can press the [GRAPH] function key. Here is what you get
PERFORMING A REGREhow do i find and use the regression capabilties - a7fbc6b.jpg>
Because I chose it so, we will perform a quadratic regression QuadReg
To do so you press [STAT] and use right arrow to select the CALC(ulate) Menu. Type 5:QuadReg
Command echoes on Main screen as QuadReg with blinking how do i find and use the regression capabilties - 30d1079.jpgbove on the right.
If you press [ENTER] the calculator will assign L1 to X and L2 to Y by default. If that does not correspond to the problem, you had better change the names of the lists used by how do i find and use the regression capabilties - 2757d7c.jpgen explicitely on the command line. Just press [2nd][L1] then [2nd] [L2] to get the following screen
Pressing [ENTER] to execute the command will get you the regression equation and its coefficients but you whow do i find and use the regression capabilties - e380d1f.jpgable to have it graphed on the scatter plot
The coefficient/factor of determination R2 is displayedhow do i find and use the regression capabilties - 0b6bc57.jpg the DiagnosticOn command from the catalaog, or as in the newer version of the OS (version 2.53MP) you press [MODE], scroll down to get to the second page of options and selected Stat Diagnostics ON
how do i find and use the regression capabilties - 3e957b3.jpgsrc="http://i.fixya.net/uploads/images/e380d1f.jpg" alt="e380d1f.jpg" class="h_mi" />
Thus to be able to draw the regression curve on the scatter plot, you must save it to a function vahow do i find and use the regression capabilties - e481e00.jpgfor example. You do it with the following command line
After you press ENTER you obtain the equation, a,b,c, and R2. By pressing the [GRAPH] function key you get the raw data and the regression on the same screen.
As you can see both are represented
TRACING THE REGRESSION CURVE
Press Trace and see what you get
As you can see the trace defaults to the scatter plot P1, L1,L2 (see the top left). If you stay on that graph you will on ly trace the actual data points (raw data). Thhow do i find and use the regression capabilties - bc62328.jpgll jump from one point to the next.
To trace the regression curve (the second curve) you musthow do i find and use the regression capabilties - 7fd58d3.jpgr on it. To do so press the Up and Down arrows. Left and right arrows allow cursor to move along the same curve.
Pressing Down Arrow you move to the regression curve. Notice the equation on the top left corner. The cursor can be displaced anywhere (depending on the resolution of the graph.
If you want Y for a particular value of X, just enter the value of X
Enter an X value. How about 5.55555?
If as I have suggested above, you copied the regression equation to Y1 variable, you can calculate Y-values for any X in the graph domain.
In Main calculator screen type the numerical value of X, say 4.777756, and store it in X-variable
4.777756 [STO>] [X,T,theta,n] [ENTER]
Calculator answers Done
Press [VARS][>][Y-VARS][1:Function...][1:Y1] [ENTER]
The calculator computes the value of Y1 for the entered value of X.
You can also generate a whole table, but you will have less control over the points where Y1 will be calculated.
Posted on Aug 24, 2010
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Posted on Jan 02, 2017
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