Which Day is Most Negative for Nifty? I Backtested 10 Years of Data to Find the Truth 📉📊
Traders often talk about "Monday Blues" or "Friday Profit Booking," but does the data actually support these myths? I ran a full backtest on over 2,695 trading sessions of Nifty 50 data to identify which day of the week is most likely to end in the red.
Key Takeaways
The 50/50 Trap: Negative days are distributed almost equally across the week, making it nearly impossible to predict a "red day" based on the calendar alone.
Tuesday's Stealth Bias: Tuesday actually holds the highest percentage of negative closings at 55.72%.
The Coin Flip: Every day has a 51% to 55% chance of being negative, proving that the market is remarkably balanced.
Logic over Luck: Trading based on a "day of the week" is a high-risk strategy unless combined with structural data.
The Hook
Is there a specific day when the Nifty is "destined" to fall? Most traders swear by the Monday Blues, but after backtesting a decade of data, I found that your chances of a negative close are almost exactly the same as a coin flip.
1. The "Day of the Week" Myth vs. Reality
In the world of trading, we often look for patterns to simplify the chaos. One of the oldest "bugs" in trading logic is the belief that certain days are inherently more bullish or bearish.
To de-bug this theory, I analyzed the total count of negative sessions (days where the close was lower than the open) for every Monday through Friday over the last 10+ years.
2. The Data Dump: Monday to Friday Breakdown
Here is the raw data from the backtest. If you thought Monday was the worst, think again.
3. The Tuesday "Anomaly"
While all days hover around the 50% mark, Tuesday stands out with a 55.7% negative closing probability. In a sample size of over 500 Tuesdays, this 4-5% deviation is significant enough for an Algo Trader to take note, but not enough to bet the house on.
Interestingly, Friday—the day often blamed for "weekend profit booking"—is actually the least negative day of the week in our data set at 51.03%.
The Personal View
As an AMFI Registered Distributor and Algo Trader, my conclusion is simple: The calendar is not an indicator. This data proves that the market is "Efficient." If a specific day was consistently negative, the "System" would arbitrage it away. While Tuesday shows a slight bearish bias, trying to time your entry or exit purely based on the day of the week is an "unhandled exception" in a professional trading plan.
My Advice: Don't fear the "Monday Blues." Instead, focus on price action and structural triggers. A Tuesday might be negative 55% of the time, but if the underlying trend is bullish, that 55% won't save your short position.
Dhaval Visariya
AMFI Registered Distributor (ARN-327925) | Software Developer & Finance Enthusiast
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Disclaimer: I am an AMFI Registered Mutual Fund Distributor. Views expressed here are for educational purposes. Mutual Fund investments are subject to market risks, read all scheme related documents carefully.
📧 Contact: info.apollofinancialservices@gmail.com
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