[R] [External] add equation and rsqared to plot

[David Winsemius]

Try this:


lm_eqn = function(m) {
     l <- list(a = format(coef(m)[1], digits = 4),
               b = format(abs(coef(m)[2]), digits = 4),
               r2 = format(summary(m)$r.squared, digits = 3),
               r2adj = format(summary(m)$adj.r.squared, digits = 3));
     if (coef(m)[2] >= 0)  {
         eq <- substitute(italic(y) == a + b %.% italic(x), l)
     } else {
         eq <- substitute(italic(y) == a - b %.% italic(x),l)

     }
     req <- substitute(italic(r)^2~"="~r2* ","~~italic(adj.r)^2~"="~r2adj,l)
     a_regs <- substitute( atop(eq, req), list(eq=eq,req=req))
}

-- 

David.

On 4/6/22 13:47, PIKAL Petr wrote:
> Hallo Richard.
>
> Did you try the example? I Used atop but with the syntax I made, the result is
>
> eq
> req
>
> but not the equations.
>
> I send the picture, but I am not sure if it will go through.
>
> Best regards
> Petr
>
> ________________________________________
> Od: Richard M. Heiberger <rmh using temple.edu>
> Odesláno: 6. dubna 2022 22:36
> Komu: PIKAL Petr
> Kopie: r-help using r-project.org
> Předmět: Re: [External] [R] add equation and rsqared to plot
>
> I think you are looking for atop(a,b)
> See ? plotmath
>
>> On Apr 06, 2022, at 15:58, PIKAL Petr <petr.pikal using precheza.cz> wrote:
>>
>> Dear all
>>
>>
>> I want to add equation and rsquared values to plot and I am lost in correct expression form. I want to have 2 lines, one with equation and one with r squared values.
>>
>>
>> Here is what I made.
>>
>> # function to extract values from lm fit.
>>
>>
>> lm_eqn = function(m) {
>>   l <- list(a = format(coef(m)[1], digits = 4),
>>       b = format(abs(coef(m)[2]), digits = 4),
>>       r2 = format(summary(m)$r.squared, digits = 3),
>>       r2adj = format(summary(m)$adj.r.squared, digits = 3));
>>   if (coef(m)[2] >= 0)  {
>>     eq <- substitute(italic(y) == a + b %.% italic(x), l)
>>   } else {
>>     eq <- substitute(italic(y) == a - b %.% italic(x),l)
>>
>>   }
>>   req <- substitute(italic(r)^2~"="~r2* ","~~italic(adj.r)^2~"="~r2adj,l)
>>   expression(atop(eq, req))
>> }
>>
>>
>> #Example
>>
>> x <- 1:10
>> y <- x*5 +rnorm(10)
>> plot(x,y)
>> fit <- lm(y~x)
>> text(4,40, lm_eqn(fit))
>>
>>
>> I know that both eq and req are correct expressions and when the last line in function is either eq or req, the example gives correct result.
>>
>>
>> But how to get both expressions one above the other is mystery.
>>
>> Please help.
>>
>>
>> Best regards.
>>
>> Petr
>>
>>
>>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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