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[amibroker] True Strength Index - AFL Code Needed



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TSI = 100 * ( EMA( EMA( C - Ref( C, -1 ) ,25 ) ,13) 
/ EMA( EMA( abs( C - Ref( C, -1) ),25 ), 13 ) );

When I save the above as an indicator and insert it - I get blank 
space!!  What am I doing wrong?  Did I miss a plot or graph line code?

Second qts - how do I incorporate a 'signal' line and the following 
(read below from Thom Hartle's article in Active Trader)

"Most TSI values fall between +25 and -25, and Blau suggested using 
these values as overbought and oversold levels, respectively. 

Blau also advised adding a signal line — in this case, a seven-period 
EMA of the TSI line — to better indicate trend changes (similar to the 
role of the signal line in the MACD)."









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