Threaded Mode | Linear Mode

Steve Simpkin · (This post was last modified: 08-22-2023 06:45 AM by Steve Simpkin.)

(08-22-2023 05:16 AM)nickapos Wrote:
(08-21-2023 04:30 PM)KeithB Wrote: Here is a good example from the Prime:
https://www.hpmuseum.org/forum/thread-20349.html

I am not sure what is going on in Home mode, but the answer was close enough that most people would not question it.

I think this is a problem that exists with most tools, when you try to exceed their designed accuracy.
...

I found it interesting the most of the recent Casio and TI scientific non-graphing calculators that I tested with came up with the exact same answer to the above referenced quadratic regression problem as Excel did. So far only the HP Prime in Home mode had less-accurate answers. It appears that the Casio's I tried have a resolution of 15-significant digits. The TI's have either 13 or 14 digits. The HP Prime has 12 digits, the same as the Saturn based HPs. I also found it interesting that the HP-48/49/50 series did not have the option to calculate quadratic regression built-in to their feature set. TI graphing models have had this ability since the TI-82 introduced in 1993.