1 instruments.). The instruments used in this research is based on measurement of strength characteristic of self confidence in athletes (Trait Robustness. Of Self-Confidence Inventory: TROSCI), Stuart Beattie Lew Hardy Jennifer Savage Tim Woodman,,,& Nichola Callow (2011) which was translated and investigating the content validity (Content Validity) of แบบสอบถามโดย experts qualified doctoral degree in Sport Psychology And the sports science.By the way Back Translation have questions measured strength according to character of self-confidence ในนัก Sports Youth were 8 items 8 elements that represents the strength according to characteristic of self confidence in young athletes.Standard Test Method 9 rank (Rank 1 is not true for me, and the top 9 is true for me) as a table 1
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