Home/ Questions/Q 6999543
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-27T20:33:17+00:00

I need to use this formula to calculate the upper limit and lower limit

  • 0

Formula for calculating the upper and lower limit

I need to use this formula to calculate the upper limit and lower limit for the below vector. Please help..

 > a <- c(2150, 2261, 2018, 2217, 2074, 1986, 1662, 2324, 1591, 1700, 1809, 1824, 2026, 2169, 2072, 1463, 1484, 841, 851, 3742, 889, 905, 1203, 967, 1776, 1075, 1031)
 > a
 [1] 2150 2261 2018 2217 2074 1986 1662 2324 1591 1700 1809 1824 2026 2169 2072
 [16] 1463 1484  841  851 3742  889  905 1203  967 1776 1075 1031
Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    This is just a simple R formula:

    UL = mean(a) + 2.66*sum(abs(diff(a)))/length(a)
LL = mean(a) - 2.66*sum(abs(diff(a)))/length(a)

    The tricky part is |X_i – X_(i-1)| and so we use a few built-in R functions:

    • diff gives X_i – X_(i-1)
    • abs gives the absolute value

    the first part of the formula is the mean and the +/- is just split up.

    • 0