Calculate Concordance Correlation Coefficient

Calculate the concordance correlation coefficient (CCC) and it's significance value from two vectors of related data.

Usage

calc_ccc(x, y)

Arguments

x, y

numeric(n) vectors of the same length.

Value

A list of the following:

rho.c:

The concordance correlation coefficient (CCC).

ci95:

The 95 percent confidence intervals of the CCC.

Z:

The z-score of the CCC.

p.value:

The p-value corresponding to the Z-score.

References

Lawrence Lin, Biometrics (45): 255-268.

See also

cor(), pnorm()

Author

Stu Field

Examples

calc_ccc(rnorm(100), rnorm(100))
#> $rho_c
#> [1] -0.03993185
#> 
#> $ci95
#>      lower      upper 
#> -0.2331064  0.1562745 
#> 
#> $Z
#> [1] -0.0399531
#> 
#> $p_value
#> [1] 0.9681305
#> 

v <- rnorm(100)
calc_ccc(v, v + 1)
#> $rho_c
#> [1] 0.6843539
#> 
#> $ci95
#>     lower     upper 
#> 0.6190700 0.7402445 
#> 
#> $Z
#> [1] 0.8372579
#> 
#> $p_value
#> [1] 0.4024476
#>