More on brackets
I would like to raise 2 further points re Bland & Altman's
Is not the correct formula ln[p/(1-p)] ?
Then the example given comes to ln(1/4) = -ln(4).
The original formula is missing a '-' rather than brackets: it
transforms to ln[(1-p)/p]; as noted, this equates to ln(4).
It is important that this matter is cleared up before the BMJ becomes
a source of questionable formulae.
(1) Douglas G Altman and J Martin Bland
Research Methods & Reporting: Brackets (parentheses) in formulas
BMJ 2011; 343:d570
Competing interests: No competing interests