This function returns the critical value(s) from a t-distribution
given a central probability and degrees of freedom. This is particular useful for creating confidence
intervals.
Usage
ct(p, df, side = c("upper", "both", "lower"))
Arguments
- p
The probability associated with the critical value(s).
- df
The degrees of freedom of the t-distribution.
- side
A string that must be either "upper", "both", or "lower" indicating whether the
' area associated with the probability p is in the upper tail, both tails, or lower tail.
Examples
# Get the critical value for a 95% confidence interval from the t-distribution with 10 degrees of freedom
ct(0.95, df = 10, side = "both")
#> [1] -2.228139 2.228139