> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# CSR sec CTP vega risk position correlations

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|                                      |                                                                                                                                             |
| ------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------- |
| **Description**                      | The correlation parameter between vega sensitivities within the same bucket, under the ‘Medium correlations’ scenario                       |
| **Variations**                       | [high-low](./high-low)                                                                                                                      |
| **Hierarchies required in the view** | [CSR Sec CTP Vega Double Sums](./csr-sec-ctp-vega-double-sums), [CSR Sec CTP Buckets](./csr-sec-ctp-buckets)                                |
| **Reference**                        | [\[MAR21.94\]](https://www.bis.org/basel_framework/chapter/MAR/21.htm?inforce=20230101\&published=20200327#paragraph_MAR_21_20230101_21_94) |
| **Notation**                         | $rho_kl MediumCorr$                                                                                                                         |
| **Formula**                          | $\displaystyle \rho_{kl}=min\left [\rho_{kl}^{DELTA} \cdot \rho_{kl}^{option\ maturity};1 \right ]$                                         |

Correlation parameter $\rho_{kl}$ between vega sensitivities within the same bucket ('medium' correlation scenario).