Casio has redesigned the ClassPad series' software keyboard to make this new model easier to use, organizing functions to correspond to three levels of learning difficulty, beginning with basic functions used by everyone like fractions, square roots, and trigonometric functions, then advanced functions like differential calculus, complex compound numbers, and sigma calculations, and finally even more advanced calculations including piecewise and user-defined formulas.

ENGADGET: Casio's touchscreen graphing calculator arrives in 2013, makes the TI-84+ look dated

All these have a survivorship bias: investments mentioned at dinner parties, stocks charted in Value Line, entrepreneurs featured in FORBES, stock market histories (does your data set include the --100% compound annual return on Russia over the past century?), available hedge fund performance numbers and every mutual fund ad.

FORBES: Magazine Article