On 30/10/2015 12:30 PM, Liam Shaw wrote:
A student noticed that passing 'F' for 'FALSE' did not have an effect when
using functions in the stats base package.
Example:
pt(q=1.12, df=12, lower.tail=TRUE)
[1] 0.8576851
pt(q=1.12, df=12, lower.tail=F)
[1] 0.8576851
pt(q=1.12, df=12, lower.tail=FALSE)
[1] 0.1423149
I couldn't replicate the problem. Re-installing and updating R on their
machine had no effect. Does anybody know what could be causing this?
F is a variable. If the student says
F <- 1
it would have that effect. This is why we recommend that you never use
F when you want FALSE.
Duncan Murdoch
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