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Eddie W. Shore · 02-20-2018, 01:41 PM

The BA-55 has the [x<>y] key to:

1. Allow for bi-variate data entry: (x data [x<>y] y data [Σ+])

2. In two variable statistical analysis, pressing [x<>y] switches between standard deviation of x and standard deviation of y [σn-1]. This also applies for population deviation [ σn ].

3. The key also switch operands. This could be useful in correcting the order of the arguments in subtraction and division operations. Example: I want to calculate 78 - 26 but enter 26 - 78 by mistake:

26 [ - ] 78 (display: 78)
[x<>y] (switches the operands, display: 26)
[ = ] (result: 52, 78 - 26)

Regarding the preference of y^x instead of x^y, I honestly have no idea.