## Search found 40 matches

- Fri Sep 10, 2021 6:57 pm
- Forum: Discuss!
- Topic: Standard error of forecast
- Replies:
**10** - Views:
**742**

### Re: Standard error of forecast (error propagation in fitting?)

Hi Walter, I fear I do not understand you well. The formula I gave is not the standard value of the sample values but for a value x0 that may be a sample value or may not be. I do not know what t is and 2,0.683 Is a typo by sure but even if I read it as 2 I cannot see why this multplication makes se...

- Sat Sep 04, 2021 12:18 pm
- Forum: Discuss!
- Topic: Standard error of forecast
- Replies:
**10** - Views:
**742**

### Re: Standard error of forecast (error propagation in fitting?)

Hi Walter, s(e) should not be replaced by s(y). In the wikipedia article sigma is defined only implicitly. Under the headline "t-test" you see it is assumed that the error term is normally distributed with mean 0 and variance sigma^2. From this it is clear that the sigma used later is the ...

- Fri Sep 03, 2021 7:52 am
- Forum: Discuss!
- Topic: Standard error of forecast
- Replies:
**10** - Views:
**742**

### Re: Standard error of forecast (error propagation in fitting?)

Hi Pierre, your formula delivers the standard error of all y-values of the regression, one result for all y-values together (see the example in Excel). The formula I posted delivers the standard error for one single value which may be in the data set of the regression analysis but may as well be an ...

- Thu Sep 02, 2021 8:24 pm
- Forum: Discuss!
- Topic: Standard error of forecast
- Replies:
**10** - Views:
**742**

### Re: Standard error of forecast (error propagation in fitting?)

Hi Walter, the formula for the variance of a forecasting value f is: S(f)^2 = S(e)^2 * (1+(1/N) + (x0-mean(x))^2/sum(xi-mean(x))^2) Whereas: N = number of observations mean(x) = arithmetic mean of x x0 = value of x for which you want a forecast Se^2 = sum(yi-(a+b*xi))^2/(N-2) a is the constant, b th...

- Sat Aug 28, 2021 3:46 pm
- Forum: Software Library
- Topic: Crypting and decrypting text messages
- Replies:
**0** - Views:
**162**

### Crypting and decrypting text messages

With this program you can crypt and decrypt text messages. This is the DM 42 version of a DM 41 X program that can be found here: https://forum.swissmicros.com/viewtopic.php?f=30&t=3095 Application: At the beginning you are asked for the starting value of the random number generator: SEED? Take ...

- Sat Aug 28, 2021 10:46 am
- Forum: User Software Contributions
- Topic: Encryption and decryption of text
- Replies:
**0** - Views:
**158**

### Encryption and decryption of text

This program allows to encrypt and decrypt messages. Application: At the beginning you are asked for the starting value of the random number generator: SEED? Take any number between 0 and 1. The same number has to be used for encryption and decryption. Then you are asked whether you want to encrypt ...

- Mon Aug 09, 2021 9:51 am
- Forum: Usage tips, tricks and problem reports
- Topic: Problem with input of numeric label
- Replies:
**3** - Views:
**236**

### Re: Problem with input of numeric label

Thank you very much for your answer, it worked.

And sorry that I did not realize that it was already discussed. I did not know that it was discussed there.

Best

Raimund

And sorry that I did not realize that it was already discussed. I did not know that it was discussed there.

Best

Raimund

- Mon Aug 09, 2021 8:09 am
- Forum: Usage tips, tricks and problem reports
- Topic: Problem with input of numeric label
- Replies:
**3** - Views:
**236**

### Problem with input of numeric label

Hi, whenever I want to input a numeric label in my DM 42 (by pressing f PGM.FCN - LBL or XEQ f ALPHA LBL) the Alpha-Mode is switched on. In the lowest line of the screen the Alphabet is shown above the 6 top line keys and the sign |A| is in the first line of the screen. I am not able to switch off t...

- Sat Jul 31, 2021 9:24 am
- Forum: DM1x/DM41
- Topic: DM15L_M1B and Matrix limits
- Replies:
**1** - Views:
**214**

### Re: DM15L_M1B and Matrix limits

Hi Boub65, you are right: The manual for the HP 15 C states, that there can be a total of 64 matrix elements, that can be used for 1 matrix or distributed to up to 5 matrices. On Swiss micros webiste (found here: https://www.swissmicros.com/product/dm15l ) there is only the limitation that the maxim...

- Tue Jul 27, 2021 7:44 am
- Forum: Discuss!
- Topic: May 2021 Speculations
- Replies:
**162** - Views:
**26824**

### Re: May 2021 Speculations

Boub65 wrote: I just hope it's a landscape calculator... Perhaps you are right. Perhaps it is a DM 42 L? There already was a prototype: https://www.youtube.com/watch?v=314JMYJEh6k This would make sense because the 42 has the solve and integrate function included and can handle matrix and imaginary n...