How do I include a superscript to texts on a plot on R?

Question

I need it to look like this:

R^2 = some values

And I\'ve tried the code below but it wouldn\'t work, it came out as \"R (expression (^2)) = some values\" i

Answer 1

How to include formatting and mathematical values in plots is FAQ 7.13.

For example, if ahat is an estimator of your parameter a of interest, use

title(substitute(hat(a) == ahat, list(ahat = ahat)))

(note that it is ‘==’ and not ‘=’). Sometimes bquote() gives a more compact form, e.g., title(bquote(hat(a) = .(ahat)))

where subexpressions enclosed in ‘.()’ are replaced by their values.

demo(plotmath) is also useful.

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In this case, you can use either

title(substitute(R^2 = rsq, list(rsq = format(rsquarelm2, digits = 2))))

or

title(bquote(R^2 == .(format(rsquarelm2, digits = 2))))

(format is more appropriate here than round, since you want to control how the value is displayed rather than creating an approximation of the value itself.)