They call it the forgotten oscillator.
The last time it saw any real significant use was during the 1970s. Traders and investors have all but ignored it in recent decades.
While the Kairi relative index (KRI) is a long-abandoned indicator, called useless by some.
The Kairi Relative Index tracks the daily average price of a stock compared to its current deviation from that average.
The idea is that the Kairi Relative Index is a simple relative comparison to help you tell in the short-term whether a stock is being overvalued (sell) or undervalued (buy).
If the current price of a stock is higher than the daily average price (for the last two or three weeks), then it’s trading higher than usual, meaning it would be a good time to sell.
If the current price is lower than the daily average, then it’d be a not-so-good time to sell, on average.
The Kairi Relative Index is one of many tools under the technical analysis umbrella, and under the type of tool: oscillator since it's based on the change in the price of something over time.
Kairi- KRI calculates the deviation of the current price from its simple average as a percent of the moving average.
KRI = [close – SMA(close, n) / SMA(close, n) ] * 100
SMA = Simple Moving Average
n = calculation time period
If the percent is rather high and positive - is signals to sell, large and negative - to buy.