# Tutorial 128 | Calculating RSI for another bar span without using data 2

## Using the a Price Series Provider to calculate RSI

It is sometimes useful to calculate the RSI for a time frame different from that of the symbol applied as Data 1, i.e. say you had a five minute chart but wanted to see what the RSI would be on a 60 minute chart. You could use additional data streams (data2, data3 etc) but this might not be convenient or possible. For example, if you use data2 then you could no longer use Intrabarordergeneration and it is not possible to use data2 with a tick, volume or advanced data chart.

One solution is to use a Price Series Provider (PSP) as demonstrated in this tutorial. The standard Tradestation RSI indicator is applied to a 60 minute GBPUSD chart on the left. _Tutorial128_PSP_RSI is applied to a 5 minute GBPUSD chart on the right, but is displaying a 60 minute RSI

With most standard calculations on TradeStation we begin on the first bar of the chart and then perform the calculation on each bar moving forward. With a PSP we have the option to perform calculations by looking back at the data stored in the PSP. It is this technique that we will use in this tutorial. You might wish to compare the calculation in the TradeStation RSI function with the calculations in this tutorial.

Please let me know if you see any errors or bugs. Bear in mind that, according to TradeStation, the closing of PSP bars and Chart/RadarScreen bars in real-time, are not synchronized. Therefore, the time stamp of PSP ticks (updated events) may not match the time stamp of data stream ticks. This can result in small differences between an RSI calculated. An image showing how tutorial 128 plots in real time (to the right of the image)

#### Programming lessons in _Tutorial128_PSP_RSI

The tutorial demonstrates how to:

• Create an instance of the Price Series Provider by using the EasyLanguage toolbox and populating the property fields
• Emulate the RSI function that calculates the first value of NetChgAvg and TotalChgAvg when CurrentBar = 1 (see the RSI function for a comparison)
• Calculate the RSI values historically
• Calculate the RSI values in real time in an efficient manner
• Plot RSI values and change the plot colors when it becomes oversold or overbought

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## Video explanation of  _Tutorial128_PSP_RSI

Rather than talk through the program that has already been written, in the following videos I recreate the program in four steps.

### Part 1 | Initial setup

The spreadsheet in this video assume that, at the moment is is run, the PSP.Count is equal to 20 and we are using a length of 5.

### Part 2 | Calculate the equivalent of what is calculated in the standard function when Currentbar = 1

The spreadsheet in this video assume that, at the moment is is run, the PSP.Count is equal to 20 and we are using a length of 5.

### Part 4 | Make the calculation more efficient for real time bars

Please let me know if you spot any bugs or errors or have questions.

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