View source: R/item_split_half.R
item_split_half | R Documentation |
Compute various measures of internal consistencies for tests or item-scales of questionnaires.
item_split_half(x, digits = 3)
x |
A matrix or a data frame. |
digits |
Amount of digits for returned values. |
This function calculates the split-half reliability for items in
x
, including the Spearman-Brown adjustment. Splitting is done by
selecting odd versus even columns in x
. A value closer to 1
indicates greater internal consistency.
A list with two elements: the split-half reliability splithalf
and the Spearman-Brown corrected split-half reliability
spearmanbrown
.
Spearman C. 1910. Correlation calculated from faulty data. British Journal of Psychology (3): 271-295. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1111/j.2044-8295.1910.tb00206.x")}
Brown W. 1910. Some experimental results in the correlation of mental abilities. British Journal of Psychology (3): 296-322. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1111/j.2044-8295.1910.tb00207.x")}
data(mtcars)
x <- mtcars[, c("cyl", "gear", "carb", "hp")]
item_split_half(x)
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