Dear Users Regarding the NADA package, would anyone be able to help me understand what values are actually plotted on the Y axis of the plot obtained by using the *ros* function on the data and plotting the result with the plot() function? The Y axis is labeled "Values". According to the NADA user manual, ros performs a log transformation of the data by default, but the user can specify no transformation, or some other transformation besides log, if desired. However the values plotted on the Y axis appear to be the raw data values, regardless of which transformation or no transformation was used. If the log transformation is used for instance, I would have expected the logs of the original data instead of the raw data to be plotted on the Y axis. Thanks for your help. Janh [[alternative HTML version deleted]]
Somebody just might be able to help if you read the Posting Guide mentioned in
the email footer, post using plain text, and make a reproducible example [1].
[1]
http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example
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Janh Anni <annijanh at gmail.com> wrote:
>Dear Users
>Regarding the NADA package, would anyone be able to help me understand
>what
>values are actually plotted on the Y axis of the plot obtained by using
>the
>*ros* function on the data and plotting the result with the plot()
>function? The Y axis is labeled "Values". According to the NADA
user
>manual, ros performs a log transformation of the data by default, but
>the
>user can specify no transformation, or some other transformation
>besides
>log, if desired. However the values plotted on the Y axis appear to be
>the
>raw data values, regardless of which transformation or no
>transformation
>was used. If the log transformation is used for instance, I would have
>expected the logs of the original data instead of the raw data to be
>plotted on the Y axis.
>
>Thanks for your help.
>Janh
>
> [[alternative HTML version deleted]]
>
>______________________________________________
>R-help at r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.
According to ?ros, one of the arguments is:
reverseT: A name of a function to use for reversing the transformation
after performing the ROS fit. Defaults to 'exp'.
And in the Details section:
By default, 'ros' performs a log transformation prior to, and
after operations over the data.
Given those statements, perhaps the expectation should be a plot in
original units?
Keep in mind that a main purpose is summary statistics in the original
units.
After running the first example in ?ros, including the plot, try these:
unclass(myros)
abline(h=myros$modeled,col='blue')
-Don
--
Don MacQueen
Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062
On 3/20/13 5:48 PM, "Janh Anni" <annijanh at gmail.com> wrote:
>Dear Users
>Regarding the NADA package, would anyone be able to help me understand
>what
>values are actually plotted on the Y axis of the plot obtained by using
>the
>*ros* function on the data and plotting the result with the plot()
>function? The Y axis is labeled "Values". According to the NADA
user
>manual, ros performs a log transformation of the data by default, but the
>user can specify no transformation, or some other transformation besides
>log, if desired. However the values plotted on the Y axis appear to be the
>raw data values, regardless of which transformation or no transformation
>was used. If the log transformation is used for instance, I would have
>expected the logs of the original data instead of the raw data to be
>plotted on the Y axis.
>
>Thanks for your help.
>Janh
>
> [[alternative HTML version deleted]]
>
>______________________________________________
>R-help at r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.