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Subject 2. Measurement Scales on this scale represent equal differences in temperature, but a temperature of 30°F is not twice as warm as one of 15°F.
Ratio scales are like interval scales except that they have true zero points. <span>This is the strongest measurement scale. In addition to permitting ranking and addition or subtraction, ratio scales allow computation of meaningful ratios. A good example is the Kelvin scale of temperature. This scale has an
last interval [days]
repetition number in this series
scheduled repetition interval
last repetition or drill
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