What the chart indicators measure—and what they do not
An indicator is a transformation of historical price or volume data. It can summarize a pattern consistently, but it is not independent evidence about the future. MarketLens displays several indicators so visitors can inspect different aspects of the same history.
Moving averages: smoothing price history
A simple moving average (SMA) is the arithmetic mean of the closing prices in a chosen window. A 50-period SMA gives equal weight to each of the latest 50 closes. An exponential moving average (EMA) gives more weight to recent observations, so it responds more quickly when price changes. MarketLens displays SMA 50 and EMA 20/50 for context.
When a shorter average is above a longer average, some chart readers describe the relationship as an uptrend; the reverse is often called a downtrend. That language summarizes a past relationship. Moving averages lag by design and can produce repeated crossovers when prices move sideways.
Relative Strength Index (RSI)
RSI compares smoothed average gains with smoothed average losses over a lookback window. MarketLens uses 14 periods and Wilder-style smoothing after the initial averages.
RSI = 100 − (100 ÷ (1 + RS))
The result ranges from 0 to 100. Levels near 70 and 30 are commonly watched as potential “overbought” and “oversold” zones, but these labels do not mean that a reversal must happen. In a strong trend, RSI can remain elevated or depressed for an extended time. RSI is also sensitive to the chosen period and the quality of the underlying price series.
MACD: comparing two exponential averages
The Moving Average Convergence/Divergence (MACD) line is the 12-period EMA minus the 26-period EMA. The signal line is a 9-period EMA of the MACD line. The histogram is the difference between those two lines.
Signal = EMA(9) of MACD
Histogram = MACD − Signal
A rising histogram means the MACD line is moving upward relative to its signal line; it does not, on its own, establish that price will rise. MACD is derived from the same closing prices as the moving averages, so it is not a separate data source. Crossovers may occur after a move has already happened.
Bollinger Bands: price relative to recent variation
MarketLens uses a 20-period simple moving average as the middle band and places the upper and lower bands two standard deviations above and below it. Wider bands reflect greater recent variation; narrower bands reflect less. Price touching a band is not automatically a reversal signal. In a strong move, price can track one side of the bands, and volatility can expand or contract without predicting direction.
Average True Range (ATR): a range measure
True range for a period is the greatest of: high minus low, absolute high minus the prior close, or absolute low minus the prior close. ATR smooths true range; the tool uses a 14-period value. ATR measures recent movement size, not direction. A larger ATR means the instrument has recently moved more in absolute price terms; comparing ATR values across different prices or assets requires care. MarketLens also shows ATR as a percentage of the latest displayed price for rough context.
Volume comparisons
The tool compares the latest volume with a 20-period average. A high relative-volume reading can show that more units traded than in the recent baseline. It does not reveal who traded, whether the activity was informed, or whether the price change is durable. Some providers omit volume for certain instruments; missing volume should not be interpreted as zero market interest.
Why several indicators can disagree
Trend indicators, momentum oscillators and volatility measures answer different questions. Moving averages summarize direction over a window; RSI summarizes recent gains versus losses; ATR summarizes range; Bollinger Bands put price in the context of recent dispersion. They are all derived from overlapping market history, so counting them as six independent confirmations would overstate the evidence. MarketLens’s simple score is a transparent display convention, not a probability model.
For a general description of technical analysis, see Investor.gov. That resource is educational and is not an endorsement of MarketLens.