Trigonometric regressions on hp 48?

[thomasross]

Hi,

Is there a program or any way to do since cosine and tangent regressions on the HP 48?

[Eddie W. Shore]

Trigonometric regressions will have to be programmed on the HP 48, as they are not default regressions offered through the Stat menu.

[thomasross]

Do you know of any programs for the HP 48 to do this?

[Han]

(04-14-2017 06:07 AM)thomasross Wrote:  Do you know of any programs for the HP 48 to do this?

You can use SOLVESYS to do a regression using ANY formula (including trig formulas). The documentation for SOLVESYS even includes an example of how to do a regression.

[thomasross]

(04-14-2017 08:06 PM)Han Wrote:  

(04-14-2017 06:07 AM)thomasross Wrote:  Do you know of any programs for the HP 48 to do this?

You can use SOLVESYS to do a regression using ANY formula (including trig formulas). The documentation for SOLVESYS even includes an example of how to do a regression.

Thanks! Do you just need to enter how many data entries you have as the third parameter? Is there any way to do it automatically?

[Csaba Tizedes]

(04-11-2017 03:20 AM)thomasross Wrote:  Hi,

Is there a program or any way to do since cosine and tangent regressions on the HP 48?

Can you post here a data and a regression function to see clearly what you needed exactly?!?

Thanks!
Csaba

[Han]

(04-15-2017 09:58 AM)Csaba Tizedes Wrote:  

(04-11-2017 03:20 AM)thomasross Wrote:  Hi,

Is there a program or any way to do since cosine and tangent regressions on the HP 48?

Can you post here a data and a regression function to see clearly what you needed exactly?!?

Thanks!
Csaba

Here's the documentation online: http://isa.umh.es/calc/ss49docs/solve49.htm

Scroll down to "Example 3: Nonlinear least-squares" to see an example. In your case, you would simply need to change the data; you will also need to change the formula to something like: 'Y=A*COS(B*T ADD C) ADD D'