# TTR_0.21-0 on CRAN

An updated version of TTR is now on CRAN. It contains some much-needed bug fixes (most notably to stockSymbols), some small changes, and a few new functions. Note that the change to wilderSum will affect functions that use it (e.g. ADX).

Here are the full contents of the CHANGES file:

TTR version 0.21-0

Changes from version 0.20-2

NEW FEATURES:

- Added variable moving average function, VMA.
- Added Brian Peterson’s price bands function, PBands.
- Added David Varadi’s DVI indicator, DVI.

CHANGES:

- Added wilder and ratio arguments to DEMA. Thanks to Matthew Fornari for the suggestion.
- Changed wilderSum to seed initial value with raw sum. This matches Wilder’s original calculations. Thanks to Mahesh Bp for the report.
- The BBands sd calculation now uses the population instead of sample statistic. This is consistent with Bollinger Band literature. Thanks to Jeff Ryan for the patch.

BUG FIXES:

- Fixed stockSymbols for nasdaq.com changes.
- Fixed ZLEMA default ratio by changing it from 2/(n-1) to 2/(n+1). This makes it consistent with EMA. Thanks to Dirk Eddelbuettel.
- Corrected close-to-close volatility. Thanks to James Toll for the report.
- adjRatios failed (spectacularly) if there were missing close prices. Thanks to Garrett See for the report.