NA's in segmented

Mod = lm(as.numeric(data[,"meanMSD25"])~(as.numeric(data[,"Slice"])), weights=1*sqrt(as.numeric(data[,"Detec"])))

-----Original Message-----
From: R-help <r-help-bounces at r-project.org> On Behalf Of M?lina Cointe
Sent: Tuesday, March 8, 2022 9:45 PM
To: r-help at 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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