[R] NA's in segmented

[PIKAL Petr]

Hi

1. Do not use HTML formated mail, your message is scrambled
2. With your code only you can get result all of us get error

> Mod = lm(as.numeric(data[,"meanMSD25"])~(as.numeric(data[,"Slice"])), weights=1*sqrt(as.numeric(data[,"Detec"])))
Error in data[, "meanMSD25"] : 
  object of type 'closure' is not subsettable
Try to provide reproducible example.

3. with lm it is not necessary to use data[,"meanMSD25"], you should provide your data object to data option in lm call (it is silly to call your data data - fortune("dog") applies here)
4. why do you use as.numeric(data[,"meanMSD25"]), shouldn't the column be numeric itself?

So my  wild guess is that you read the data into R wrong way and instead of numeric they are character, which could be one source of your problem.

Cheers
Petr

> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of Mélina Cointe
> Sent: Tuesday, March 8, 2022 9:45 PM
> To: r-help using r-project.org
> Subject: Re: [R] NA's in segmented
> 
> Hi,
> 
> I�m contacting you because I have some trouble with the slope() function of
> segmented. When I plot the predicted value everything seems to have worked
> well. But when I use slope(), the slope for the first segment is a line with 0
> and Nas� Also I can get a negative slope whereas on the graph it�s clearly a
> positive slope�
> 
> Here are the lines I�m using :
> 
> Mod = lm(as.numeric(data[,"meanMSD25"])~(as.numeric(data[,"Slice"])),
> weights=1*sqrt(as.numeric(data[,"Detec"])))
>   x = (as.numeric(data[,"Slice"]))
>   o <- segmented(Mod, seg.Z=~x, psi=NA, control=seg.control(display=FALSE,
> K=2))
> 
> Thanks in advance for your help,
> 
> Best regards,
> 
> M�lina COINTE
> 
> 
> 
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