I was reading a research paper and was wondering if "ds= .56 to .63" was a quantitative means of measuring the study, or if it was related to referencing? 
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sigte
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3Please provide the reference. Without context, this could be anything including a typo. – Tim Apr 18 '22 at 09:45
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A Google search suggests https://static1.squarespace.com/static/5353b838e4b0e68461b517cf/t/5cda5ada6e9a7f5573458d7e/1557813983729/beyond+willpower.pdf near the start of page 108: Duckworth AL, Milkman KL, Laibson D. 2018. Beyond willpower: strategies for reducing failures of self- control. Psychol. Sci. Public Interest 19:102–29
It looks as if $d$s is the plural of $d$, which is earlier described as mean differences, presumably between treatment and control. It may be Cohen's $d$ as a measure of effect size.
Henry
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