ci.mad1 {statpsych} | R Documentation |
Computes a confidence interval for a population mean absolute deviation from the median (MAD). The MAD is a robust alternative to the standard deviation.
ci.mad1(alpha, y)
alpha |
alpha level for 1-alpha confidence |
y |
vector of scores |
Returns a 1-row matrix. The columns are:
Estimate - estimated mean absolute deviation
LL - lower limit of the confidence interval
UL - upper limit of the confidence interval
Bonett DG, Seier E (2003). “Confidence intervals for mean absolute deviations.” The American Statistician, 57(4), 233–236. ISSN 0003-1305, doi: 10.1198/0003130032323.
y <- c(30, 20, 15, 10, 10, 60, 20, 25, 20, 30, 10, 5, 50, 40, 20, 10, 0, 20, 50) ci.mad1(.05, y) # Should return: # Estimate LL UL # [1,] 12.5 7.962667 19.62282