Retro Review: BA-55
02-20-2018, 01:41 PM
Post: #5
 Eddie W. Shore Senior Member Posts: 1,302 Joined: Dec 2013
RE: Retro Review: BA-55
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.
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 Messages In This Thread Retro Review: BA-55 - Eddie W. Shore - 02-19-2018, 08:57 PM RE: Retro Review: BA-55 - Gene - 02-19-2018, 09:34 PM RE: Retro Review: BA-55 - Gene - 02-19-2018, 09:39 PM RE: Retro Review: BA-55 - Eddie W. Shore - 02-20-2018, 01:42 PM RE: Retro Review: BA-55 - martinot - 02-19-2018, 10:01 PM RE: Retro Review: BA-55 - Eddie W. Shore - 02-20-2018 01:41 PM RE: Retro Review: BA-55 - martinot - 02-20-2018, 09:54 PM RE: Retro Review: BA-55 - Massimo Gnerucci - 02-20-2018, 10:46 PM RE: Retro Review: BA-55 - martinot - 02-21-2018, 09:02 AM RE: Retro Review: BA-55 - Gene - 02-20-2018, 11:06 PM RE: Retro Review: BA-55 - Eddie W. Shore - 02-21-2018, 03:00 AM RE: Retro Review: BA-55 - martinot - 02-21-2018, 09:11 AM RE: Retro Review: BA-55 - Eddie W. Shore - 02-21-2018, 01:29 PM RE: Retro Review: BA-55 - martinot - 02-24-2018, 12:57 AM RE: Retro Review: BA-55 - Gene - 02-21-2018, 01:18 PM

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