what is the true strength index tsi 
the true strength index tsi is a technical momentum oscillator used by technical analysts the true strength index is used to identify trends and reversals in the market the indicator may determine overbought and oversold conditions indicate potential trend direction changes via centerline or signal line crossovers and warn traders of trend weakness that may occur through divergence image by sabrina jiang investopedia 2021formula and how to calculate the true strength index tsi the formula for calculating the tsi involves the following steps tsi pcds apcds x 100 pc ccp pcp pcs 25 period ema of pc pcds 13 period ema of pcs apc avccp pcp apcs 25 period ema of apc apcds 13 period ema of apcs where pcds pc double smoothed apcds absolute pc double smoothed pc price change ccp current close price pcp prior close price pcs pc smoothed ema exponential moving average apc absolute pc apcs absolute pc smoothed begin aligned text tsi pcds apcds x 100 text pc ccp text pcp text pcs 25 period ema of pc text pcds 13 period ema of pcs text apc avccp text pcp text apcs 25 period ema of apc text apcds 13 period ema of apcs textbf where text pcds pc double smoothed text apcds absolute pc double smoothed text pc price change text ccp current close price text pcp prior close price text pcs pc smoothed text ema exponential moving average text apc absolute pc text apcs absolute pc smoothed end aligned tsi pcds apcds x 100pc ccp pcppcs 25 period ema of pcpcds 13 period ema of pcsapc avccp pcpapcs 25 period ema of apcapcds 13 period ema of apcswhere pcds pc double smoothedapcds absolute pc double smoothedpc price changeccp current close pricepcp prior close pricepcs pc smoothedema exponential moving averageapc absolute pcapcs absolute pc smoothed the main skill required in computing the tsi is the ability to calculate an exponential moving average ema 