To compute the lambda_1 using the rule-of-thumb methods.

1 | ```
lambda.select(W,msigma, method="SJ", na.rm = FALSE, ...)
``` |

`W` |
The observed data. It is a vector of length at least 10. |

`msigma` |
The standard deviation |

`method` |
Specifies the bandwidth of 'W'. It can be a single numeric value which has been pre-determined; or computed with the specific density bandwidth selector: 'nrd0', 'nrd', 'ucv', 'bcv', 'SJ'. |

`na.rm` |
is set to FALSE by default: no NA value is allowed. |

`...` |
control |

X.F. Wang wangx6@ccf.org

Wang, X.F., Sun, J. and Fan, Z. (2011). Deconvolution density estimation with heteroscedastic errors using SIMEX.

`simex.density`

, `simex.H.density`

.

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