# Find out the value of the trend line. How to Find the Equation of a Trend Line - Video & Lesson Transcript | samuray-club.com

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Not only would we like the calculator to find a trend line for us, we want to graph that line also. To have the calculator put our line into Y1, we need the following keystrokes: Now when you press the calculator will show the numbers for the trend line and put that find out the value of the trend line into Y1 for you. Notice that my calculator has been set to two decimal places.

If your calculator did not show r and r2 there is a way to get them to appear on the screen. That equation is in Y1 and can be graphed along with the data points by simply pressing.

We can now use that trend line to predict the annual income of someone with 15 years of formal education. We just substitute 15 for x in our equation and get So it is reasonable to expect someone with 15 years of formal education to make approximately 31, Remember that the data was given in thousands of dollars. However, we have to be careful not to go too far away from our original data.

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The line that we found describes the data we put into the calculator. Data that is too far away from our original numbers will not be as accurate.

Now what can we do if your calculator did not show r and r2. Then use the repeatedly until you see DiagnosticOn.

### Re: getting values off a trend line

Then press and again. You will now have to redo the regression command, but you should now see r and r2 on your screen. The r value is what is known as a correlation coefficient. It is a number to tell how well the straight line fits the data.

As the r value gets closer to 0, the worse the fit gets. In our case, the r value of.

### Estimating lines of best fit

The r2 value is found just by squaring the r value. In statistics, the r2 value describes how much of the variation in the data is accounted for by the trend line. It is a very interesting topic, but also fairly complicated to understand.

If you are interested in further statistical analysis of data, see your statistics teacher. You should now be able to input data, graph it, find the trend line and graph it with the data, use the trend line to make a prediction, and find the r and r2 values for the line.

Signals for binary options investing skills will be very useful to you not only in your math class, but also in your science class, or anywhere you deal with data collection and analysis. S Taylor.