U.S. Stock Technical Analysis: A Practical Beginner’s Guide to RSI and MACD

TL;DR： RSI (Relative Strength Index) and MACD (Moving Average Convergence Divergence) are two of the most widely used momentum indicators in U.S. stock technical analysis. RSI is used to identify overbought or oversold conditions, while MACD captures trend direction and momentum shifts. Using them together can improve the reliability of trading signals; however, technical indicators are inherently lagging. Any decision should still be supported by fundamental analysis and strict risk management.

When analyzing U.S. stock trends, many investors face charts crowded with lines and often don’t know where to start. In fact, the core tools of U.S. stock technical analysis aren’t complicated, and RSI and MACD are two of the most practical beginner-friendly indicators. These two tools help investors assess price action more objectively from two dimensions: “the strength of market sentiment” and “the direction of trend momentum.” This article explains in depth how RSI and MACD work, how to interpret their signals, and how to combine them to build a more comprehensive analytical framework. A reminder: technical analysis is a decision-support tool and does not guarantee any outcome; all investments involve risk.

RSI (Relative Strength Index): A Core Tool for Momentum Signals

RSI (Relative Strength Index) was proposed by technical analyst J. Welles Wilder in 1978. It is a momentum oscillator that measures the relative magnitude of price gains and losses over a given period. RSI ranges from 0 to 100 and intuitively reflects shifts in short-term buying and selling pressure.

How to Interpret RSI Readings

The basic interpretation uses 50 as the dividing line:

• RSI above 70: The market may be overbought. Some analysts view this as a reference signal of short-term overheating and monitor potential pullback risk.
• RSI below 30: The market may be oversold. Some analysts view this as a reference signal that downside momentum is weakening, potentially increasing the chance of a rebound.
• RSI between 50 and 70: A relatively bullish market; upward momentum remains intact.
• RSI between 30 and 50: A relatively bearish market; downward momentum dominates price action.

Note: Entering the overbought zone (above 70) does not mean the stock price will inevitably fall. In a strong bull market, RSI can remain above 70 for an extended period—often called “overbought saturation.” Calling a reversal too early under such conditions may lead to false signals.

Considerations for RSI Period Settings

The most commonly used RSI lookback is 14 trading days, the original default and a solid baseline for most investors. For short-term trading, some technical analysts use a 7–9 day period to increase sensitivity; however, higher sensitivity also raises the frequency of false signals. Conversely, for swing trading or longer holding periods, a 21-day or longer period may be considered to obtain smoother, more stable signals.

RSI Divergence: An Important Clue for Advanced Judgement

RSI divergence is an important but often overlooked signal in technical analysis and comes in two forms:

Bearish divergence (top divergence): Price makes a new high, but the RSI peak is lower than the previous peak. This indicates that upward momentum is weakening and the market may enter consolidation or a reversal phase. For example (hypothetical): if a stock rises from USD 100 to USD 120 and then to USD 130, while RSI falls from 75 to 72 and then to 68, this is a classic bearish divergence pattern.

Bullish divergence (bottom divergence): Price falls to a new low, but the RSI trough is higher than the previous trough. This suggests that downside momentum is weakening and a rebound may emerge.

It should be emphasized that divergence is merely a technical observation and does not guarantee the market will move as expected. Cross-validation with other indicators is particularly important.

MACD Indicator: Dual Signals for Trend Direction and Momentum

MACD (Moving Average Convergence Divergence) was introduced in the 1970s by investment manager Gerald Appel. MACD is notable for combining two functions—trend following and momentum oscillation—and is regarded by many technical analysts as a key reference tool for assessing medium-term trends.

The Three Components of MACD

MACD consists of the following three elements:

Changes in the histogram height reflect momentum intuitively: a rising histogram suggests strengthening upward or downward momentum, while a shrinking histogram indicates weakening momentum.

Key MACD Crossover Signals

Golden cross (reference buy signal): When the DIF line crosses above the DEA line from below and the histogram turns from negative to positive (often depicted from green to red), technical analysts typically view this as a reference signal that the trend may be shifting from down to up.

Death cross (reference sell signal): When the DIF line crosses below the DEA line from above and the histogram turns from positive to negative (often depicted from red to green), technical analysts typically view this as a reference signal that the trend may be shifting from up to down.

Important reminder: MACD is a lagging indicator. Its signals are calculated from historical price data. In fast-moving markets, MACD crossovers may lag; in range-bound markets, false signals may occur frequently. Investors should remain cautious.

The Warning Function of MACD Divergence

Similar to RSI, MACD can also form divergence patterns. If price continues making new highs while the peaks of the MACD histogram gradually decline, this is a bearish MACD divergence, technically indicating that upward momentum is weakening. Conversely, if price continues making new lows while the MACD histogram troughs rise, this is a bullish divergence. In practice, divergence should be assessed together with additional information and should not be used as a standalone trading basis.

Key Differences Between RSI and MACD

To combine RSI and MACD effectively, it is first necessary to understand their fundamental differences:

RSI’s core function is to measure the relative strength between buyers and sellers over a specific period, quantifying whether market sentiment is overheated or overly depressed. It is an oscillator.

MACD’s core function is to track changes in trend direction and momentum by analyzing the relationship between two moving averages, indicating whether a trend is strengthening or weakening. It is a trend-following indicator.

Because they are different types of indicators, when both generate signals in the same direction, some analysts believe this “double confirmation” can be relatively more reliable.

Practical Applications of Combining RSI and MACD

In U.S. stock technical analysis, some technical analysts combine RSI and MACD to cross-validate market signals from two different dimensions.

Double Reference Buy Signal

When both of the following occur, some analysts view it as a stronger reference buy signal:

• RSI rebounds after falling below 30, rising out of the oversold zone
• MACD simultaneously forms a golden cross, with the DIF line crossing above the DEA line

Double Reference Sell Signal

When both of the following occur, some analysts view it as a stronger reference sell signal:

• RSI pulls back after rising above 70, declining from the overbought zone
• MACD simultaneously forms a death cross, with the DIF line crossing below the DEA line

Important clarification: Even when two indicators signal simultaneously, it does not mean the trade outcome will necessarily be accurate. Markets are influenced by many factors, and any technical signal can be wrong; past indicator performance cannot be used as the basis for future results.

How to Handle Conflicting Indicator Signals

In real trading, RSI and MACD may sometimes generate opposing signals—for example, MACD shows a golden cross while RSI shows bearish (top) divergence. In such cases, market disagreement is evident. Some technical analysts recommend adopting a “wait-and-see, reduce trading activity” approach and waiting until signals become more aligned before making a judgment.

Use Cases for Technical Analysis in U.S. Stocks

The U.S. stock market differs from the Hong Kong market. U.S. trading hours are 9:30 a.m. to 4:00 p.m. Eastern Time (10:30 p.m. to 5:00 a.m. Hong Kong time; one hour earlier during Daylight Saving Time). In addition, macro events such as U.S. corporate earnings releases and Federal Reserve rate decisions can affect the reliability of technical indicators during certain periods.

For Hong Kong investors, before conducting U.S. stock technical analysis, it is recommended to first understand the basic operating rules of the U.S. market. You can refer to the Beginner’s Guide to U.S. Stock Investing to learn foundational knowledge such as account opening procedures, tax arrangements, and basic trading rules.

Choosing the Right Time Frame

Technical indicators do not have a universally applicable “best setting.” Their effectiveness is closely tied to an investor’s time horizon:

• Short-term traders: May reference 15-minute to 1-hour charts; the RSI period may be shortened to 7–9 days.
• Mid-term swing investors: Daily charts are typically the main reference; a 14-day RSI is generally suitable.
• Long-term investors: Technical signals on weekly or monthly charts can be more meaningful for long-term position decisions.

Combining Technical Analysis with Fundamental Analysis

Technical tools help identify potential entry and exit timing, but they cannot replace an assessment of a company’s fundamentals. If a company has major issues in business outlook or financial condition, even bullish technical signals may have limited reference value. In practice, some investors first use fundamental analysis to screen for targets worth watching, then use technical indicators to assist in identifying potential buy/sell timing.

How to Use Technical Indicators on the Longbridge Platform

Longbridge Securities provides U.S. stock trading services. The platform includes built-in technical analysis tools, including candlestick charts, moving averages, RSI, MACD, and other commonly used indicators, enabling investors to analyze and trade within the same interface.

Through Longbridge’s market data tools, investors can track real-time quotes and charts for U.S. stocks and major indices, load technical indicators directly onto charts, and conduct visual analysis.

In addition, Longbridge’s AI-powered investment research assistant PortAI can help analyze market data and corporate earnings information, providing supporting context for technical analysis. For applications of AI-assisted investment analysis, you can further learn how to leverage technology tools to support investment decisions.

FAQs

Which is more accurate, RSI or MACD?

RSI and MACD serve different purposes and have different characteristics; there is no absolute ranking of “accuracy.” RSI is better at identifying extreme overbought and oversold conditions, while MACD is more suitable for judging changes in trend direction and momentum. Because they are different types of indicators, using them together typically provides a more comprehensive perspective than relying on one alone. Any indicator can produce false signals and should not be relied upon exclusively.

Is there a scientific basis for using 70 and 30 as RSI thresholds?

70 and 30 are the most commonly used reference levels for overbought and oversold conditions, proposed by Wilder in his 1978 work. They are not absolute scientific standards but rather widely adopted conventions based on historical practice. In more volatile markets or for specific stocks, some technical analysts adjust the thresholds to 80 and 20, or other ranges that better fit historical price behavior.

Do you have to buy after a MACD golden cross appears?

Not necessarily. A MACD golden cross is a technical reference signal and does not constitute investment advice, nor does it guarantee that the price will rise afterward. Markets are influenced by many factors, and MACD may frequently generate false golden crosses in range-bound conditions. It is recommended to evaluate the signal in conjunction with RSI, trading volume, candlestick patterns, and other tools, and to fully consider your investment objectives and risk tolerance before making any trading decision.

Are technical indicators suitable for long-term investing?

Technical analysis tools were originally used more for short- to medium-term trading, but long-term investors can also reference RSI and MACD signals on weekly or monthly charts to help assess trend direction over a larger time horizon. Long-term investors generally place greater emphasis on fundamental analysis; technical analysis is used only to assist with entry/exit timing, rather than as the core decision basis.

In the U.S. market, is technical analysis more effective than in the Hong Kong market?

There are differences between the U.S. and Hong Kong markets in structure, liquidity, and participant composition, which may also lead to differences in indicator performance. The U.S. market is generally more liquid overall, and technical signals for large-cap blue chips are often clearer. However, around earnings announcements and macro policy releases, the reference value of technical analysis may decline. In any market, technical analysis should be one analytical tool—not the only basis for decision-making.

Conclusion

RSI and MACD are among the most practical entry-level tools in U.S. stock technical analysis. RSI helps identify overbought/oversold conditions and divergence signals by quantifying the relative strength of buying and selling; MACD presents trend direction and momentum shifts through moving-average crossovers and changes in the histogram. Used together, they can provide decision support from multiple dimensions.

However, all technical indicators have limitations: their lagging nature, changing market environments, and the existence of false signals all remind investors not to over-rely on any single tool. Effective investment decisions require a combination of technical analysis, fundamental research, and strict risk management. Before applying these tools in practice, thoroughly understanding how the indicators work and their potential limitations is essential for every investor.

Which tools to use depends on your investment objectives, risk tolerance, market view, and level of experience. Regardless of which investment tools you choose, you must fully understand their mechanisms, risk characteristics, and trading rules, and establish a robust risk management plan. You can learn more through Longbridge Academy or download the Longbridge App.