7310
Thanks
Mike
- Original Message -
From: "Ted Harding" <[EMAIL PROTECTED]>
To: "Mike White" <[EMAIL PROTECTED]>
Cc:
Sent: Wednesday, April 20, 2005 8:58 AM
Subject: RE: [R] Help with predict.lm
> Sorry, I was doing this too late last night!
> All st
On 20-Apr-05 Mike White wrote:
> Ted
> Thank you for giving me so much of your time to provide
> an explanation of the likelihood ratio approach to the
> calibration problem. It has certainly provided me with a
> new insight into this problem. I will check out the
> references you mentioned to get
Sorry, I was doing this too late last night!
All stands as before except for the calculation at the end
which is now corrected as follows:
On 19-Apr-05 Ted Harding wrote:
[code repeated for reference]
> The following function implements the above expressions.
> It is a very crude approach to solvi
On 19-Apr-05 Ted Harding wrote:
> On 19-Apr-05 Mike White wrote:
>> Hi
>> I have measured the UV absorbance (abs) of 10 solutions
>> of a substance at known concentrations (conc) and have
>> used a linear model to plot a calibration graph with
>> confidence limits. I now want to predict the concen
root
results<-list(Predicted=xpre, Confidence=conf) ## returns results as list
to avoid warning message
return(results)
}
Thanks
Mike White
- Original Message -
From: "Ted Harding" <[EMAIL PROTECTED]>
To: "Mike White" <[EMAIL PROTECTED]>
Cc:
Sent: Tuesda
On 19-Apr-05 Mike White wrote:
> Hi
> I have measured the UV absorbance (abs) of 10 solutions
> of a substance at known concentrations (conc) and have
> used a linear model to plot a calibration graph with
> confidence limits. I now want to predict the concentration
> of solutions with UV absorban
w.abs) # gives slightly different results than
the calib function
Thanks to all who replied,
Mike White
- Original Message -
From: "Liaw, Andy" <[EMAIL PROTECTED]>
To: "'Mike White'" <[EMAIL PROTECTED]>;
Sent: Tuesday, April 19, 2005 1:53 PM
Subject:
> Hi
> I have measured the UV absorbance (abs) of 10 solutions of a
> substance at known concentrations (conc) and have used a
> linear model to plot a calibration graph with confidence
> limits. I now want to predict the concentration of solutions
> with UV absorbance results given in the ne
Will this help?
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/1202.html
[Found by RSiteSearch("calibration") in R-2.1.0.]
Andy
> From: Mike White
>
> Hi
> I have measured the UV absorbance (abs) of 10 solutions of a
> substance at
> known concentrations (conc) and have used a linear model to
Hi
I have measured the UV absorbance (abs) of 10 solutions of a substance at
known concentrations (conc) and have used a linear model to plot a
calibration graph with confidence limits. I now want to predict the
concentration of solutions with UV absorbance results given in the new.abs
data.frame
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