# Correct x/y correlations using Case IV

### Description

`caseIV`

uses Hunter and Schmidt's (2004) correction procedure to
estimate the correlation between t and p, assuming direct selection on a
latent s.

### Usage

1 | ```
caseIV(rtpi, rxxi, rxxa, ux)
``` |

### Arguments

`rtpi` |
the correlation between t and p in the incumbent pool. |

`rxxi` |
the reliability of x in the incumbent pool. |

`rxxa` |
the reliability of x in the applicant pool. |

`ux` |
the ratio of selected to unselected variance in x. |

### Value

a scalar that is the estimate of the correlation between t and p.

### Author(s)

Dustin Fife

### References

Hunter, J.E., and Schmidt, F.L. (2004). Methods of meta-analysis: Correcting error and bias in research findings. Thousand Oaks, CA: Sage.

### See Also

See Also `rel.correction`

to obtain estimates of rtpi
from rxyi, `caseIII`

, `em`

, `caseIIIR`

### Examples

1 2 3 4 5 | ```
# correct an xy correlation for unreliability
rtpi = rel.correction(rxyi=.3, rxxi=.8, ryyi=.6)
# estimate Case IV
caseIV(rtpi=rtpi, rxxi=.6, rxxa=.8, ux=.8)
``` |

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