Description Usage Arguments Details Value Author(s) References Examples

Estimates the sample size to achived the specified precision in the estimated calibration equation.

1 | ```
samplesize(x0, d0, cutpts = c(7.5, 42.5, 57.5, 72.5, 200), CVx, CVy)
``` |

`x0` |
The value at which calibration will be esitmated (e.g., 30 nmol/L) |

`d0` |
Targeted width of the 95% confidence interval of the calibrated value (e.g. 5nmol/L) |

`cutpts` |
Cut points used to define intervals, within which samples would be selected uniformly |

`CVx` |
CV% of the old method (e.g. 12%) |

`CVy` |
CV% of the reference (new) method (e.g. 5%) |

The function estimates the sample size to achived the specified precision in the estimated calibration equation. The precision is defined via x0 and d0

Required sample size to achived the specified precision in the estimated calibration equation.

Durazo-Arvizu, Ramon, Sempos, Chris and Tian, Lu

Tian L., Durazo-Arvizu R. A., Myers G., Brooks S., Sarafin K., and Sempos C. T. (2014), The estimation of calibration equations for variables with heteroscedastic measurement errors, Statist. Med., 33, pages 4420-4436

1 | ```
samplesize(30, 5, cutpts=c(7,42,57,72,200),0.12, 0.05)
``` |

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.