Estimation methods for zero-inflated Poisson factor analysis (ZIPFA) on sparse data.
It provides estimates of coefficients in a new type of zero-inflated regression.
It provides a cross-validation method to determine the potential rank of the data in the ZIPFA
and conducts zero-inflated Poisson factor analysis based on the determined rank.
Matrix, doParallel, foreach, optimx, trustOptim

Tianchen Xu [aut, cre] (<https://orcid.org/0000-0002-0102-7630>),
Ryan T. Demmer [aut],
Gen Li [aut]

Permutations Tests and Performance Indicator for Zero-Inflated
Proportions Response
Permutations tests to identify factor correlated to zero-inflated proportions response. Provide a performance indicator based on Spearman correlation to quantify the part of correlation explained by the selected set of factors. See details for the method at the following preprint e.g.: <https://hal.archives-ouvertes.fr/hal-02936779v3>.
R (>= 3.5.0), rgenoud, purrr, data.table, parallel

markdown, knitr, ggplot2, ggrepel, ggthemes, kableExtra,
stringr

ZOIP Distribution, ZOIP Regression, ZOIP Mixed Regression
The ZOIP distribution (Zeros Ones Inflated Proportional) is a proportional data distribution inflated with zeros and/or ones, this distribution is defined on the most known proportional data distributions, the beta and simplex distribution, Jørgensen and Barndorff-Nielsen (1991) <doi:10.1016/0047-259X(91)90008-P>, also allows it to have different parameterizations of the beta distribution, Ferrari and Cribari-Neto (2004) <doi:10.1080/0266476042000214501>, Rigby and Stasinopoulos (2005) <doi:10.18637/jss.v023.i07>. The ZOIP distribution has four parameters, two of which correspond to the proportion of zeros and ones, and the other two correspond to the distribution of the proportional data of your choice. The 'ZOIP' package allows adjustments of regression models for fixed and mixed effects for proportional data inflated with zeros and/or ones.
person("Juan Camilo", "Diaz Zapata", email = "jucdiazza@unal.edu.co", role = c("aut", "cre"))
Juan Camilo Diaz Zapata <jucdiazza@unal.edu.co>