# Evidence-based assessment/Probability nomogram

*New for Fall 2022*:

**HGAPS and Psychology Conferences**

HGAPS is finding new ways to make psychological science conferences more accessible!

Here are examples from APA 2022 and the JCCAP Future Directions Forum. Coming soon... ABCT!

~ More at HGAPS.org ~

EBA Implementation |
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Assessment phases |

Steps 1-2: Preparation phase |

Steps 3-5: Prediction phase |

Steps 6-9: Prescription phase |

Steps 10-12: Process/progress/outcome phase |

## Overview[edit | edit source]

A probability nomogram is a visual tool for interpreting how new information changes the probability of a clinical issue such as a diagnosis or risky behavior. It uses Bayes' Theorem to combine the initial probability with the change in likelihood attached to the new assessment finding. The user locates the probability and likelihood on the nomogram and then connects the two points and extends the line to read the updated probability. The nomogram is a fast and free way to estimate updated probabilities without having to do any mental computation, making it more appealing for many practitioners.