Cronbach (1951) coefficient alpha

Cronbach (1951) coefficient alpha

Usage

CttAlpha(X)

Arguments

X

n persons x k items score matrix

Value

list(alpha, estimate, item_var, sum_item_var, total_var, n_items, n)

Examples

M <- matrix(c(1, 2, 3, 4, 5, 6), nrow = 2)
CttAlpha(M)
#> $alpha
#> [1] 1
#> 
#> $estimate
#> [1] 1
#> 
#> $item_var
#> [1] 0.5 0.5 0.5
#> 
#> $sum_item_var
#> [1] 1.5
#> 
#> $total_var
#> [1] 4.5
#> 
#> $n_items
#> [1] 3
#> 
#> $n
#> [1] 2
#> 
#> $method
#> [1] "Cronbach (1951) alpha = k/(k-1) (1 - sum V_i / V_t)"
#>