Description Usage Arguments Details Value

This function returns `TRUE`

if and only if the lasso solution
satisfy the KKT condition.

1 | ```
checkKKT(y, X, lambda, beta.hat, tol = 1e-05)
``` |

`y, ` |
the response vector. |

`X, ` |
the design matrix. |

`lambda, ` |
the tuning parameter. |

`beta.hat, ` |
the lasso solution. |

`tol, ` |
the tolerance. |

This function assumes the quadratic loss is scaled by *1/2n*. That is,

*1/(2n) * ||y-Xβ||_2^2 + λ * ||β||_1*

This function returns the desired logical result.

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