#### Home >> (Table of Contents) Studies and Indicators >> Technical Studies Reference >> Volume Weighted Average Price - VWAP - Rolling with Standard Deviation Lines

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### Volume Weighted Average Price (VWAP) - Rolling with Standard Deviation Lines

The **Volume Weighted Average Price (VWAP) - Rolling with Standard Deviation Lines** study calculates and displays the volume weighted average price over the specified period of time for the symbol of the chart.

This calculation gives greater weight to trade prices that have a higher volume.

This study uses the same calculation method as the standard Volume Weighted Average Price (VWAP) study does, except that for every bar in the chart it calculates volume weighted average price over the specified period of time starting at the bar going back by that specified period of time. So the calculation period is continuously rolling.

This differs from the standard Volume Weighted Average Price study which segments the overall time in the chart by the specified period of time and incrementally calculates the volume weighted average price at each bar within that period of time and resets itself when a new time segment is encountered. For example, for a 1 Day period, the segment will start at the beginning of the trading day and end at the end of the trading day according to the Session Times for the chart. At each time segment there is a set starting point.

The study also supports calculating and displaying Standard Deviation/Fixed Offset band lines. In the case of the Standard Deviation calculation, this is based on the volume weighted difference of the selected **Input Data**, like the closing price of the chart bars, and the VWAP value.

#### Displaying or Hiding Standard Deviation/Fixed Offset Band Lines

Up to 4 Standard Deviation/Fixed Offset lines based upon the Volume Weighted Average Price line can be displayed. To display these standard deviation band lines, follow the steps below.

- Open the
**Study Settings**window for the**Volume Weighted Average Price - Rolling**study. - Select the
**Subgraphs**tab. - The Standard Deviation/Fixed Offset lines are labeled
**Top Band 1-4**and**Bottom Band 1-4**. To make a line visible, set its**Draw Style**to**Dash**. To hide it, set its**Draw Style**to**Ignore**.

Refer to the description for Band # Std. Deviation Multiplier/Fixed Offset, for information about how these lines are calculated.

#### Differences Between VWAP and Standard Deviation Lines On Different Timeframe Bars

Refer to Differences Between VWAP and Standard Deviation Lines On Different Timeframe Bars for the standard **Volume Weighted Average Price** study.

Values calculated by this study will be different from the non-rolling Volume Weighted Average Price because a rolling period of time is used and there is no resetting at the beginning of a new time segment.

#### Standard Deviation Band Calculation

Refer to Standard Deviation Band Calculation.

#### Inputs

- Input Data
**Time Period Type**: Sets the type of time period for the calculation. This Input works in conjunction with**Time Period Length**. The**Time Period Type**can be one of the following:**Days - Trading Days**: With this setting, the**Time Period Length**Input specifies the number of Trading days the VWAP calculation is performed over at each chart bar. When using**Days - Trading Days**the VWAP calculation is rolling day by day and*not*bar by bar.

For example, if**Time Period Length**is set to 3, then for any given bar within a trading day, the VWAP calculation includes the data for that particular chart bar, all the chart bars for the trading day that bar is within, and the prior 2 trading days going back to the Session Start Time on that second prior day.

For rolling bar by bar, set**Time Period Type**to**Days - 24 Hour Period**or**Minutes**and specify the number of Days or Minutes with the**Time Period Length**Input.

A trading day is from the**Session >> Start Time**to the**End Time**settings in the chart. For complete details, refer to Session Times.

With**Days - Trading Days**, every time a new day begins, you can and most likely will notice an obvious shift in the VWAP value because the furthest day back in time that was previously being used in the VWAP calculation is no longer included. It is not a bar to bar rollover, but a day to day rollover. If you want a bar to bar rollover, then set this Input to**Days - 24 Hour Period**instead.**Days - 24 Hour Period**: With this setting, the**Time Period Length**Input specifies the number of rolling 24-hour periods (days) the calculation is performed over. When using**Days - 24 Hour Period**the calculation is rolling bar by bar.**Minutes**: The**Time Period Length**Input specifies the number of minutes. The VWAP calculation will be rolling bar by bar.**Bars**: The**Time Period Length**Input specifes how many bars the VWAP calculation is performed over The VWAP calculation will be rolling bar by bar.

**Time Period Length**: Sets the quantity to be used with**Time Period Type**. For example, for a period of 1 Day, set this to 1 and set**Time Period Type**to**Days - Trading Days**. In the case of a Length of 1 with**Time Period Type**set to**Days - Trading Days**the calculation will be done on the current trading day only.**Base on Underlying Data**: When this Input is set to**No**, which is the default, then the price and volume data for the calculations are from the bars in the chart. The last trade price of the the bar is used, the default, and the total volume of the chart bar is used.

To base the calculations on the underlying price and volume data which is more detailed than the chart bars, set this Input to**Yes**. When this Input is set to**Yes**, the chart will be automatically reloaded to load in the more detailed Volume at Price data if it is not already voted.**Number of Days to Calculate**: This Input sets the number of days in the chart that the Volume Weighted Average Price calculations will be done over relative to the last Date in the chart. The default value is 10. It is recommended to set this as small as is needed to minimize the calculation time since the study can take a significant amount of time to do calculations across many days of data. This setting is not the same as**Time Period Length**. It*does not*control the length of the calculation for a particular chart bar.

The very first bar in the chart where the calculation begins at according to the**Number of Days to Calculate**Input will not have any prior data reference. Therefore, the VWAP result at that chart bar is based upon just that one bar. On the next bar in the chart after that first bar, will only have two bars in the VWAP calculation. It is not until the bar in the chart that has a sufficient number of prior bars to calculate the VWAP according to the**Time Period Type**and**Time Period Length**Inputs, will then give a correct result. Until that bar, the calculation is considered a developing calculation.

It is for the reason described in the prior paragraph that when you perform a full recalculation of the chart through**Chart >> Recalculate**after additional data has been added to the chart during real-time updating or during a replay, that you can notice a change in the VWAP values because at prior chart bars where previously there was sufficient underlying VWAP data, there may no longer be sufficient underlying VWAP data relative to the last Date in the chart based on this Input setting.

It is recommended that this setting be set twice the**Time Period Length**Input setting to ensure there is sufficient data for the VWAP calculation at each chart bar during the length of the calculation.**Start Date-Time**: This Input can optionally be set to a starting Date-Time to begin the calculations at for the Volume Weighted Average Price study. It is necessary to specify both the Date and the Time together. To disable the Start Date-Time Input, set it to a date before the first date in the chart. This will effectively disable it.**Exclude Weekends in Date Look Back**: When this Input is set to**Yes**, Saturday and Sundays are skipped when determining how many days back to include in the calculation according to the**Time Period Length**Input. This input applies when**Time Period Type**is set to**Days - Trading Days**or**Days - 24 Hour Period**. This option must still be set to**Yes**even when weekends are excluded from the chart in**Chart >> Chart Settings >> Session Times**.**Minimum Required Time Period as Percent for Skip Days**:This Input only applies when the

**Time Period Type**is set to**Days - Trading Days**or**Days - 24 Hour Period**.This study employs special logic when looking back at the previous days, to determine if there is sufficient data. If there is insufficient data, it looks back to the period before the first period it originally referenced.

This is very useful for holidays and Sunday trading. There is no need to remove data from periods where there is insufficient data. You can control the functioning of this period skipping feature with this Input. For example, if you want there to be at least 50% or more of the bars needed for 1 day period, then set this Input to 50.

When this study determines the number of bars that are needed for a period, it does not consider the Session Times settings in

**Chart >> Chart Settings**. For example, if you are just including the Day Session only in your chart, then there are going to be fewer bars available. Therefore, you need to consider this when setting this percentage. So if you have less than the full 24 hour Session of bars in the chart, then you will want to use a lower percentage to avoid skipping periods.It does not make sense to set this input to 100. This will only likely trigger unnecessary skipping when you do not intend that.

**Standard Deviation Band Calculation Method**: This can be set to**VWAP Variance, Fixed Offset**or**Standard Deviation**. For the formulas for each, refer to Standard Deviation Band Calculation.**Band # Std. Deviation Multiplier/Fixed Offset**: When the standard deviation**Top # Band**and**Bottom # Band**Subgraphs are set to be displayed, this Input specifies how far the band lines are from the Volume Weighted Average Price line.

When the**Standard Deviation Band Calculation Method**Input is set to**VWAP Variance**or**Standard Deviation**, then this Input specifies the value multiplied by the VWAP Variance or Standard Deviation. For example, if the Input is set to 2.0, then the band would be offset by 200% of the Standard Deviation.

When the**Standard Deviation Band Calculation Method**Input is set to**Fixed Offset**, then this Input becomes a fixed offset and is used to offset the Bands from the Volume Weighted Average Price by the specified amount. Bands 1-4 are offset by the exact amounts.

*Last modified Sunday, 08th October, 2017.