CHNOSZ (version 0.9-5)

util.stat: Miscellaneous Statistical Functions

Description

Calculate root mean square deviation (RMSD), coefficient of variation of the RMSD, Spearman's rank correlation coefficient, and correlation coefficient on a q-q plot.

Usage

qqr(a)
  spearman(a, b)
  rmsd(a, b)
  cvrmsd(a, b)
  lograt(a, b)

Arguments

a

numeric values.

b

numeric values.

Details

qqr returns the correlation coefficient of a quantile-quantile plot using the values given in y. This calculation can used to characterize the deviation of a given set of values from a normal distribution.

spearman calculates Spearman's rank correlation coefficient between a and b. rmsd and cvrmsd return the root mean square deviation and coefficient of variation of the RMSD, repsectively. The coefficient of variation is computed as the RMSD divided by the mean of the values in a

lograt calculates the difference between a and b (i.e. log10 of the ratio of activities b/a) where a is a list of single values and b is a list of values, any dimension.

See Also

These functions are among the target statistics available in revisit.

Examples

a <- 1:9
  b <- a + 1
  spearman(a, b)       # 1
  spearman(a, rev(b))  # -1
  qqr(a)               # <1
  rmsd(a,a)            # 0
  rmsd(a,b)            # 1
  cvrmsd(a,b)          # 1/5