Can be measured in kilograms pounds etc. The level of measurement of a variable is nothing but the mathematical nature of a variable or how a variable is measured.
Scales Of Measurement Level Of Measurement Statistics How To
What level of measurement is body weight. Can be used in computations. And cannot have a value below zero. At each level up the hierarchy the current level includes all of the qualities of the one below it and adds something new. An example of the ratio level of measurement is weight. A high bmi can be an indicator of high body fatness. At lower levels of measurement assumptions tend to be less restrictive and data analyses tend to be less sensitive.
You can also measure body fat percentage with a scale and tape measure. The nominal level variables are organized into non numeric categories that cannot be ranked or compared quantitatively. Its important to recognize that there is a hierarchy implied in the level of measurement idea. We can compare these values on a number line. Due to the presence of a zero it now makes sense to compare the ratios of measurements. Quantitative numerical values representing counts or measures.
Body mass index bmi is a persons weight in kilograms divided by the square of height in meters. 3 types of data. Phrases such as four times and twice are meaningful at the ratio level. These variables have a natural order. Bmi can be used to screen for weight categories that may lead to health problems but it is not diagnostic of the body fatness or health of an individual. Variables that can be measured on a ratio scale have the following properties.
Broadly there are 4 levels of measurement for the variables 1. Data at the ratio level possess all of the features of the interval level in addition to a zero value. Your body fat percentage is the percentage of your weight that comes from fat. 2 pounds is less than 4 pounds you can take a mathematical average of these values ie. 2097 01069 x height in centimeters 02466 x weight in kilograms total body weight tbw in liters to get the percentage of water in your body assume 1 liter equals 1 kilogram and then. Can be measured in centimeters inches feet etc.
A person who weights 150 pounds weights twice as much as a person who weighs only 75 pounds and half as much as a person who weighs 300 pounds. We can calculate ratios like these because the scale for weight in pounds starts at zero pounds. The fourth and highest level of measurement is the ratio level. Something we can measure with a tool or a scale or count. And cannot have a value below zero. Skin fold calipers are a common method of measuring body fat percentage but you may not have access to calipers.
Most modern body composition laboratories today use the value of 11 kilograms per litre for the density of the fat free mass a theoretical tissue composed of 72 water density 0993 21 protein density 1340 and 7 mineral density 3000 by weight.
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