Widen, Process, then Re-Tidy Data

cor_sparse | Find the Pearson correlation of a sparse matrix efficiently |

pairwise_cor | Correlations of pairs of items |

pairwise_count | Count pairs of items within a group |

pairwise_delta | Delta measure of pairs of documents |

pairwise_dist | Distances of pairs of items |

pairwise_pmi | Pointwise mutual information of pairs of items |

pairwise_similarity | Cosine similarity of pairs of items |

squarely | A special case of the widely adverb for creating tidy square... |

widely | Adverb for functions that operate on matrices in "wide"... |

widely_svd | Turn into a wide matrix, perform SVD, return to tidy form |

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