assessment {qcpm}

Assessment measures of quantile composite-based path modeling

Description

assessment returns the following measures for assessing both the inner and the outer model: communality of each manifest variable, communality of each block,redundancy of each manifest variable of endogenous blocks, redundancy of the endogenous blocks, and pseudo-R^2 for each inner equation.

Usage

assessment(qcpm)

Arguments

qcpm

is an object of class qcpm

Details

All the assessment measures discussed in Davino et al. (2016) and Dolce et al. (2021) are based on pseudo-R^2, proposed by Koenker and Machado (1999), which simulates the role and interpretation of the R^2 in classical regression analysis. The pseudo-R^2 is considered as a local measure of goodness of fit for a particular quantile as it measures the contribute of the selected regressors to the explanation of the dependent variable, with respect to the trivial model without regressors. In more technical way, pseudo-R^2 compares the residual absolute sum of weighted differences using the selected model with the total absolute sum of weighted differences using a model with the only intercept. The pseudo-R^2 can be used to assess the inner model measuring the amount of variability of a given endogenous construct explained by its explanatory constructs. A synthesis of the evaluations regarding the whole inner model can be obtained by the average of all the pseudo-R^2. Communality indicates how much of the MV variance is explained by the corresponding construct. It can be calculated for each MV, and for each block, using the average of MV communalities. Redundancy measures the percent of the variance of MVs in an endogenous block that is predicted from the explanatory constructs related to the endogenous construct. Redundancy can be computed only for each MVs of endogenous blocks and for the whole endogenous blocks, using the average of MV redundancies. Results are provided for each quantile of interest. When fix.quantile=TRUE, the function returns communalities and redundancies only for the quantile 0.5.

Value

Communality

Communality of each MV. It is the proportion of the MV variance explained by the corresponding construct.

Block_Communality

Communality of a whole block. It is computed as average of the MV communalities belonging to that block.

Redundancy

Redundancy of each MV of the endogenous blocks. It measures the percent of the variance of MVs in endogenous blocks that is predicted from the explanatory constructs related to the endogenous construct.

Block_Redundancy

Redundancy of a block. It is computed as average of MV redundancies belonging to that block.

pseudo.R2

The pseudo-R^2. It assesses the goodness of fit of the inner model.

Author(s)

Cristina Davino, Pasquale Dolce, Giuseppe Lamberti, Domenico Vistocco

References

Davino, C., Dolce, P., Taralli, S. and Vistocco, D. (2020). Composite-based path modeling for conditional quantiles prediction. An application to assess health differences at local level in a well-being perspective. Social Indicators Research, doi:10.1007/s11205-020-02425-5..

Davino, C. and Esposito Vinzi, V. (2016). Quantile composite-based path modeling. Advances in Data Analysis and Classification, 10 (4), pp. 491–520, doi:10.1007/s11634-015-0231-9.

Davino, C., Esposito Vinzi, V. and Dolce, P. (2016). Assessment and validation in quantile composite-based path modeling. In: Abdi H., Esposito Vinzi, V., Russolillo, G., Saporta, G., Trinchera, L. (eds.). The Multiple Facets of Partial Least Squares Methods, chapter 13. Springer proceedings in mathematics and statistics. Springer, Berlin

Dolce, P., Davino, C. and Vistocco, D. (2021). Quantile composite-based path modeling: algorithms, properties and applications. Advances in Data Analysis and Classification, doi:10.1007/s11634-021-00469-0.

Koenker, R. and Machado, J.A. (1999). Goodness of fit and related inference processes for quantile regression. Journal of the American Statistical Association, 94 (448) pp. 1296–1310, doi: 10.1080/01621459.1999.10473882

He, X.M. and Zhu, L.X. (2003). A lack-of-fit test for quantile regression. Journal of the American Statistical Association 98 pp. 1013–1022, doi: 10.1198/016214503000000963

See Also

summary, qcpm, boot, and reliability

Examples

# Example of QC-PM in Well-Being analysis
# model with three LVs and reflective indicators

# load library and dataset province
library(qcpm)
data(province)

# Define the model using laavan sintax. Use a set of regression formulas defining 
# firstly the structural model and then the measurement model
model <- "
ECOW ~ EDU
HEALTH ~ EDU + ECOW

# Reflective measurement model
EDU =~ EDU1 + EDU2 + EDU3 + EDU4 + EDU5 + EDU6 + EDU7
ECOW =~ ECOW1 + ECOW2 + ECOW3 + ECOW4 + ECOW5 + ECOW6
HEALTH =~  HEALTH1 + HEALTH2 + HEALTH3
"


# Apply qcpm
well.qcpm = qcpm(model,province)
well.assessment = assessment(well.qcpm)   
well.assessment