some frequently-used functions for me

ansout | export answers |

cdout | open folder |

DateIndex | return date index |

growth | calculate growth of a series |

impute_es | imputed by HoltWinters method |

impute_lm | imputed by regress |

lag | return lag series |

modeval | Model Evaluate |

reglist | return a pretty answer of regression |

similarcoef | similar coefficient of industry structure |

sortcol | order columns based on row's weighing means |

tcsi | return time series with seasonal character randomly |

vava | frequently-used functions for me |

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