reliability {cSEM} | R Documentation |
Compute several reliability estimates. See the Reliability section of the cSEM website for details.
calculateRhoC( .object = NULL, .model_implied = TRUE, .only_common_factors = TRUE, .weighted = FALSE ) calculateRhoT( .object = NULL, .alpha = 0.05, .closed_form_ci = FALSE, .only_common_factors = TRUE, .output_type = c("vector", "data.frame"), .weighted = FALSE, ... )
.object |
An R object of class cSEMResults resulting from a call to |
.model_implied |
Logical. Should weights be scaled using the model-implied
indicator correlation matrix? Defaults to |
.only_common_factors |
Logical. Should only concepts modeled as common
factors be included when calculating one of the following quality critera:
AVE, the Fornell-Larcker criterion, HTMT, and all reliability estimates.
Defaults to |
.weighted |
Logical. Should estimation be based on a score that uses
the weights of the weight approach used to obtain |
.alpha |
An integer or a numeric vector of significance levels.
Defaults to |
.closed_form_ci |
Logical. Should a closed-form confidence interval be computed?
Defaults to |
.output_type |
Character string. The type of output. One of "vector" or "data.frame". Defaults to "vector". |
... |
Ignored. |
Since reliability is defined with respect to a classical true score measurement
model only concepts modeled as common factors are considered by default.
For concepts modeled as composites reliability may be estimated by setting
.only_common_factors = FALSE
, however, it is unclear how to
interpret reliability in this case.
Reliability is traditionally based on a test score (proxy) based on unit weights.
To compute congeneric and tau-equivalent reliability based on a score that
uses the weights of the weight approach used to obtain .object
use .weighted = TRUE
instead.
For the tau-equivalent reliability ("rho_T
" or "cronbachs_alpha
") a closed-form
confidence interval may be computed (Trinchera et al. 2018) by setting
.closed_form_ci = TRUE
(default is FALSE
). If .alpha
is a vector
several CI's are returned.
For calculateRhoC()
and calculateRhoT()
(if .output_type = "vector"
)
a named numeric vector containing the reliability estimates.
If .output_type = "data.frame"
calculateRhoT()
returns a data.frame
with as many rows as there are
constructs modeled as common factors in the model (unless
.only_common_factors = FALSE
in which case the number of rows equals the
total number of constructs in the model). The first column contains the name of the construct.
The second column the reliability estimate.
If .closed_form_ci = TRUE
the remaining columns contain lower and upper bounds
for the (1 - .alpha
) confidence interval(s).
calculateRhoC
: Calculate the congeneric reliability
calculateRhoT
: Calculate the tau-equivalent reliability
Trinchera L, Marie N, Marcoulides GA (2018). “A Distribution Free Interval Estimate for Coefficient Alpha.” Structural Equation Modeling: A Multidisciplinary Journal, 25(6), 876–887. doi: 10.1080/10705511.2018.1431544, https://doi.org/10.1080/10705511.2018.1431544.