computeConfidenceBoundForLogOddsTwoProportions {safestats} | R Documentation |
Estimate an upper or lower bound for a safe confidence sequence on the logarithm of the odds ratio for two proportions.
Description
Estimate an upper or lower bound for a safe confidence sequence on the logarithm of the odds ratio for two proportions.
Usage
computeConfidenceBoundForLogOddsTwoProportions(
ya,
yb,
safeDesign,
bound = c("lower", "upper"),
deltaStart,
deltaStop,
precision
)
Arguments
ya |
positive observations/ events per data block in group a: a numeric with integer values
between (and including) 0 and |
yb |
positive observations/ events per data block in group b: a numeric with integer values
between (and including) 0 and |
safeDesign |
a 'safeDesign' object obtained through
|
bound |
type of bound to calculate; "lower" to get a lower bound on positive delta, "upper" to get an upper bound on negative delta. |
deltaStart |
starting value of the grid to search over for the bound on the confidence sequence (in practice: the interval). Numeric >0 when searching for a lower bound, numeric < 0 when searching for an upper bound. |
deltaStop |
end value of the grid to search over for the bound on the confidence sequence (in practice: the interval). Numeric >0 when searching for a lower bound, numeric < 0 when searching for an upper bound. |
precision |
precision of the grid between deltaStart and deltaStop. |
Value
numeric: the established lower- or upper bound on the logarithm of the odds ratio between the groups
Examples
balancedSafeDesign <- designSafeTwoProportions(na = 1,
nb = 1,
nBlocksPlan = 10,
alpha = 0.05)
#hypothesize OR < 1 (i.e., log OR < 0)
ya <- c(1,1,1,1,1,1,1,1,0,1)
yb <- c(0,0,0,0,1,0,0,0,0,0)
#one-sided CI for OR-, establish upper bound on log odds ratio
computeConfidenceBoundForLogOddsTwoProportions(ya = ya,
yb = yb,
safeDesign = balancedSafeDesign,
bound = "upper",
deltaStart = -0.01,
deltaStop = -4,
precision = 20)