normConstCVCI: Log-centered confidence intervals from a Normal constant coeffficient of variation model
Description
Assume Y is normal with mean mu>0 and coefficient of variation theta, then Y/mu ~ N(1, theta^2).
Get log-centered confidence intervals (when possible), meaning intervals such that log(y) +/- r(theta), where
r(theta) is a constant function of theta.
# NOT RUN {# defaults to 68.27 percent confidence level, same level as Normal plus or minus 1 std dev.normConstCVCI(3.4,.6)
# symmetric on log scalelog(normConstCVCI(3.4,.6))
# }