Estimate Sobel's (1982) indirect test for mediation. The function provides an estimate of the magnitude of the indirect effect, Sobel's first-order estimate of the standard error associated with the indirect effect, and the corresponding z-value. The estimates are based upon three models as detailed on page 84 of MacKinnon, Lockwood, Hoffman, West and Sheets (2002).

1 | ```
sobel(pred,med,out)
``` |

`pred` |
The predictor or independent variable (X). |

`med` |
The mediating variable (M). |

`out` |
The outcome or dependent variable (Y). |

`Mod1: Y~X` |
A summary of coefficients from Model 1 of MacKinnon et al., (2002). |

`Mod2: Y~X+M` |
A summary of coefficients from Model 2 of MacKinnon et al., (2002). |

`Mod3: M~X` |
A summary of coefficients from Model 3 of MacKinnon et al., (2002). |

`Indirect.Effect` |
The estimate of the indirect mediating effect. |

`SE` |
Sobel's (1982) Standard Error estimate. |

`z.value` |
The estimated z-value. |

`N` |
The number of observations used in model estimation. |

Paul Bliese paul.bliese@moore.sc.edu

MacKinnon, D. P., Lockwood, C. M., Hoffman, J. M., West, S. G., Sheets, V. (2002). A comparison of methods to test mediation and other intervening variable effects. Psychological Methods, 7, 83-104.

Sobel, M. E., (1982). Asymptotic confidence intervals for indirect effects in structural equation models. In S. Leinhardt (Ed.), Sociological Methodology 1982 (pp. 290-312). Washington, DC: American Sociological Association.

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