Typing non-Unicode statistics characters

[Joe Horn]

Many HP calculators use \(\bar{x}\) ("x-bar") and \(\hat{y}\) ("y-hat") as statistics functions, but these characters do not exist in Unicode, and would therefore seem impossible to type in this forum. However, they are easy to make using TEX, like this:

\(\bar{x}\) is typed as \(\bar{x}\)
\(\hat{y}\) is typed as \(\hat{y}\)

"Widehat" sometimes creates a slightly more visible caret than "hat".