Accuracy of Quadratic Regression

[Steve Simpkin]

(08-21-2023 09:21 PM)Steve Simpkin Wrote:  For reference, the least expensive calculator that I have that can perform Quadratic Regression is the Casio fx-991EX (about $22 USD). Its answer matched the Excel results exactly. For Statistics, this model will remember the data until you switch out of Statistics mode.

See photo of results at:
https://drive.google.com/file/d/1JUvxsNx...sp=sharing


Update:
Here are the results of the Quadratic Regression calculation on the TI-36X Pro (about $20 USD). I used the on-line TI-36X Pro Emulator for this example. Its answer also matched the Excel results exactly.

See photo of results at:
https://drive.google.com/file/d/14BazIaV...sp=sharing

Not only did the Casio fx-991EX come up with an accurate answer, its QR code feature displayed all of the data in a table, the quadratic coefficients and a graph of the data on the following web page:
Example of Quadratic Regression problem

   

The web page allows you to edit or add additional data to the data in the table, zoom or scroll on the graph, add notes and change many aspects of the results.
Pretty neat for a $22 calculator.