Calculate Price Change from a Specific Minute with RTI_Price_Change_From_Min

RTI_Price_Change_From_Min is an Excel function in MarketXLS that lets you instantly see how much a stock’s price has changed since a specific minute of the trading day. This simplifies intraday analysis, helping you track real-time fluctuations for quick decisions. By referencing a precise “HH:MM” time (or valid Excel date/time format), you can compare the last traded price to the price at that exact minute—perfect for dynamic monitoring of your open positions or spotting swings in high-volatility stocks.

Why Use This Function?

• Track intraday price changes with pinpoint accuracy.
• React faster to shifts in market prices by monitoring changes from a critical timestamp (e.g., market open).
• Seamlessly integrate with Excel-based trading models or dashboards for real-time alerts.
• Compare the current price to any in-market timestamp without manually reviewing historical data.
• Ideal for creating intraday triggers or signals within your spreadsheet.

How to Use in Excel

=RTI_Price_Change_From_Min(symbol, time)

1. Enter the symbol of the stock you want to track.
2. Provide a valid time in “HH:MM” format or use an Excel-recognized date/time (which the function will parse automatically).
3. Ensure your MarketXLS account is configured with a real-time data provider (e.g., Zerodha or AngelOne in India) for live data.

When you call this function, MarketXLS:
• Converts your time input into “HH:MM” internally (if necessary).
• Looks up the price at that specific minute.
• Subtracts that historical price from the most recent traded price (the “Last” price) to calculate the difference.

Parameters Explained

• If Excel parses the time as a valid date/time, the function automatically converts it to “HH:MM.”
• If you enter a time outside active trading hours or there is no available data at that moment, you may see unexpected or zero values.

Example Usage

Basic Examples

1. Simple Intraday Example
   Suppose you want to see how much Apple’s stock price has changed since 09:30 AM (often considered market open in the U.S.):
   =RTI_Price_Change_From_Min("AAPL", "09:30")
   This returns the difference between the current (real-time) price and the price at 09:30 AM.

2. Using an Excel Time Cell Reference
   If cell A1 contains "AAPL" and cell B1 contains a valid Excel time (e.g., 9:30 AM displayed), you can do:
   =RTI_Price_Change_From_Min(A1, B1)
   The function will parse the time in B1, convert it to “HH:MM,” and calculate the price change from that minute.

3. When the Time Includes Seconds
   Some traders note exact seconds. If your time entry in B1 is "09:31:20", MarketXLS will parse it and internally convert it to "09:31."
   =RTI_Price_Change_From_Min("AAPL", "09:31:20")

Advanced Scenarios

1. Automating Market Open vs. Pre-Market Comparison
   You can track how the price has changed from a specific pre-market time (e.g., 07:00). If supported by your data provider and you have pre-market data, the function calculates the difference from that early time.

2. Armed with Other Technical Indicators
   Combine RTI_Price_Change_From_Min with RTI_RSI or RTI_EMA in your spreadsheet to see both the intraday moves and momentum signals.
   Example:
   • Cell C2: =RTI_RSI("AAPL", 1, 20, "Last", 0)
   • Cell D2: =RTI_Price_Change_From_Min("AAPL", "09:30")
   This pair shows both RSI for the latest price candle (1-minute intervals) and the net price change from 09:30 AM.

3. Real-Time Alerts with Conditional Formatting
   Use the function in a cell, then apply Excel’s Conditional Formatting to highlight cells in green if the change is above a certain threshold or in red if below. Quickly see if short-term trading thresholds have been met.

Common Questions and Troubleshooting

1. “Why am I getting an error or ‘Invalid time format’?”
   – Ensure the time input is in “HH:MM” (e.g., "09:30"), “HH:MM:SS”, or a valid Excel date/time number. If Excel cannot parse the input, you’ll get an error.

2. “What if there isn’t any trade at that exact minute?”
   – The function will return the price at or closest to that minute, depending on the data your provider offers. When no data point exactly matches, MarketXLS uses the RTD feed’s nearest recognized price.

3. “Why do I see zero or unexpected results?”
   – Check that your time is within actual market hours and that your data provider streams real-time data for that symbol. Times outside of the provider’s coverage might yield zeros or stale data.

4. “Do I need a separate subscription for real-time data?”
   – Yes. MarketXLS typically requires a subscription from a partner like Zerodha or AngelOne to stream real-time quotes. Make sure your data seller is configured in the Settings.

5. “Can I track multiple stocks at once?”
   – Absolutely. Just reference different symbols across cells. MarketXLS tries to queue each symbol in the RTD feed if it’s not already active.

Using RTI_Price_Change_From_Min will empower your intraday trading or active monitoring with real-time data right in Excel. Whether you’re a day trader seeking short-term moves or an analyst comparing open vs. current prices, this function gives an intuitive, at-a-glance view of price changes from any crucial market minute. By integrating it with other MarketXLS functions, you can further refine your trading strategies and data-driven decisions.