Systematic patterns may be captured by latent variables using principal component analysis (PCA), factor analysis (FA), and related methods. The jackstraw enables statistical testing for association between observed variables and latent variables, as captured by PCs or other estimates. Similarly, unsupervised clustering, such as K-means clustering, partition around medoids (PAM), and others, finds subpopulations among the observed variables. The jackstraw estimates statistical significance of cluster membership, including unsupervised evaluation of cell identities in single cell RNA-seq. P-values and posterior probabilities allows one to rigorously evaluate the strength of cluster membership assignments.

Title: Jacobi Theta Functions and Related Functions
person("Mikael", "Fremling", role = "aut",
comment = "author of the original Fortran code for the theta functions")
Description: Evaluation of the Jacobi theta functions and related
functions: Weierstrass elliptic function, Weierstrass sigma function,
Klein j-function, Dedekind eta function, lambda modular function,
Jacobi elliptic functions, Neville theta functions, and Eisenstein
series. Complex values of the variable are supported.
Mikael Fremling [aut] (author of the original Fortran code for the

Weierstrass zeta function, Klein j-function, Dedekind eta function,
lambda modular function, Jacobi elliptic functions, Neville theta
functions, and Eisenstein series. Complex values of the variable are
Imports: Carlson, Rcpp (>= 1.0.8), rgl, Rvcg

Title: Jaccard Index for Population Structure Identification
Description: Uses the Jaccard similarity index to account for population
structure in sequencing studies. This method was specifically
designed to detect population stratification based on rare variants, hence it
will be especially useful in rare variant analysis.

Title: Trading Jade Lizard Option Strategies
Description: Jade Lizard and Reverse Jade Lizard Option Strategies are presented here through their Graphs. The graphic indicators, strategies, calculations, functions and all the discussions are for academic, research, and educational purposes only and should not be construed as investment advice and come with absolutely no Liability.
Russell A. Stultz (“The option strategy desk reference: an essential reference for option traders (First edition.)”, 2019, ISBN: 9781949443912).