[R] How to show a specific value of a ggplot2

[Rui Barradas]

Hello,

Neha, it's not the first time you post questions to R-Help, please, 
please!, start your scripts by loading the packages needed.

I have never used package DALEX but for what I understand from its 
documentation it  helps to explore and explain models behavior. If your 
profile plot was output by method plot.model_profile(), the workflow is 
or seems to be

1. fit a model;
2. create an object of S3 class "model_profile" with functions explain() 
and model_profile();
3. plot that object.


So to know what is the value of y for a given x, predict from the fitted 
model, package DALEX and its plots have nothing to do with it.
If there's a predict method for the fitting function, then it should be 
as simple as


newdata75 <- data.frame(x = 75)
y75 <- predict(fit, newdata = newdata75)


or something similar.

I have never used this package so I might be completely wrong.

Hope this helps,

Rui Barradas

Às 08:09 de 27/05/2022, Neha gupta escreveu:
> Thank you Rui, Avi
> 
> I am using the plot(), in the Dalex package and it implements the ggplot.
> 
> So I only used plot(mydata) and it displays the ggplot . If we need to 
> adjust or make further changes in the plot, I think people use
> 
> plot + .....
> I don't know if this group support the image pasting but my plot is 
> showing like below. (bugs is a variable in my data whose values are 
> displayed on y-axis and RFC is another variable in my dataset whose 
> value is shown on the x-axis. I want to know exactly (not necessarily 
> using the plot, a simple print function should also work for me) what is 
> the value of 'bug' when the value of 'rfc' is 75.
> 
> image.png
> 
> 
> On Fri, May 27, 2022 at 7:49 AM Rui Barradas <ruipbarradas using sapo.pt 
> <mailto:ruipbarradas using sapo.pt>> wrote:
> 
>     Hello,
> 
>     If you cannot determine the exact value of y for given x, then isn't
>     your problem how to determine an approximate value of y? Once you have
>     it, it's easy to plot it.
> 
>     With newdata = data.frame(x = 75, y = ???),
> 
> 
>     ggplot(mydata, mapping = aes(x, y)) +
>         geom_point(color = "black") +
>         geom_point(newdata, mapping = aes(x, y), color = "red") +
>         xlim(0, 200)
> 
> 
>     The question is how to find newdata$y, interpolation, other method?
> 
>     Hope this helps,
> 
>     Rui Barradas
> 
>     Às 00:40 de 27/05/2022, Neha gupta escreveu:
>      > I have a ggplot2 which has x-values 0-200 and y values 0-10
>      >
>      > p=plot(mydata)
>      > p+xlim(0, 200)
>      >
>      > I want to show what is the y value when we have 75 as x value.
>     The graph
>      > which is displayed has a broad range (like 0-50, 50-100 etc on x
>     axis) and
>      > cannot determine the exact value of y at the value of 75 on x-axis.
>      >
>      > Thank you
>      >
>      >       [[alternative HTML version deleted]]
>      >
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