An implementation of the Invariance Partial Pruning (IVPP) approach 
  described in Du, X., Johnson, S. U., Epskamp, S. (2025) The Invariance Partial 
  Pruning Approach to The Network Comparison in Longitudinal Data. IVPP is a 
  two-step method that first test for global network structural difference with 
  invariance test and then inspect specific edge difference with partial pruning. 
  The package also allows you to compute centrality measures and use radar chart to 
  plot. Analysis of bridge centralities by community pairs is also possible (e.g.,
  the bridge strength from depression to anxiety, and from depression to panic disorder).

Instrumental variable estimation for linear models by two-stage least-squares (2SLS) regression or by robust-regression via M-estimation (2SM) or MM-estimation (2SMM). The main ivreg() model-fitting function is designed to provide a workflow as similar as possible to standard lm() regression. A wide range of methods is provided for fitted ivreg model objects, including extensive functionality for computing and graphing regression diagnostics in addition to other standard model tools.

Comprehensive instrumental variables and GMM estimation with
    automatic diagnostics, inspired by the 'Stata' command 'ivreg2' of Baum,
    Schaffer, and Stillman (2003) <doi:10.1177/1536867X0300300101> and Baum,
    Schaffer, and Stillman (2007) <doi:10.1177/1536867X0800700402>. Supports
    2SLS, LIML, Fuller, k-class, two-step efficient GMM,
    and continuously-updated (CUE) estimators. Provides classical, robust,
    cluster-robust, HAC, and Driscoll-Kraay standard errors. Reports weak
    identification, underidentification, overidentification, and endogeneity
    tests at estimation time. All outputs are verified against 'Stata' within
    tight numerical tolerances.

Provides a library for generic interval manipulations using a
    new interval vector class. Capabilities include: locating various
    kinds of relationships between two interval vectors, merging overlaps
    within a single interval vector, splitting an interval vector on its
    overlapping endpoints, and applying set theoretical operations on
    interval vectors. Many of the operations in this package were inspired
    by James Allen's interval algebra, Allen (1983)
    <doi:10.1145/182.358434>.