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# What's new in Sigma

> Sigma release notes for Dec 15, 2023: Write-only data permission, VariancePop function, and more.

## Admin

### Write-only data permission

The **Can write only** permission restricts access to data while enabling users to create input tables and CSV upload that write data to the connection's write-back destination. This permission type is ideal for enabling input tables and CSV uploads in embedded workbooks with restricted data access.

For more information about the new permission type, see [Data permissions overview](https://help.sigmacomputing.com/docs/data-permissions-overview).

## Functions

### VariancePop function

The **VariancePop** function calculates population variance, which determines the spread of distribution or degree to which the column or grouped values deviate from the mean.

The addition of this function complements the existing **Variance** function, which estimates sample variance. For more information about these functions and when to use each, see [VariancePop](https://help.sigmacomputing.com/docs/variancepop) and [Variance](https://help.sigmacomputing.com/docs/variance).