weight

Examples of weight in the following topics:

• Statistical Literacy

  • Research on the effectiveness of surgery for weight loss reported here (http://www.medpagetoday.com/Endocrinology/Obesity/34820) found that "The surgery was associated with significantly greater weight loss [than the control group who dieted] through 2 years (61.3 versus 11.2 pounds, p<0.001). "
  • For each subject a difference score between their initial weight and final weight could be computed.
  • The mean difference score will equal the difference between the mean weight losses of the two groups (61.3 - 11.2 = 50.1).

• Weight

  • In physics, it is important to differentiate the weight of an object from its mass.
  • On the other hand, the weight of an object is an extrinsic quantity.
  • In US customary units, the weight of an object can be expressed in pounds.
  • In this case, the weight of the object varies due to the force of buoyancy.
  • A spring scale measures weight by finding the extent to which a spring is compressed.This is proportional to the force that a mass exerts on the scale due to its weight.

• Introduction to multiple regression exercises

  • Here, we study the relationship between smoking and weight of the baby.
  • Exercise 8.1 introduces a data set on birth weight of babies.
  • 8.3: (a) baby weight = −80.41 + 0.44 × gestation − 3.33 × parity − 0.01 × age + 1.15 × height + 0.05 × weight − 8.40 × smoke.
  • (d) baby weight = 120.58. e = 120 − 120.58 = −0.58.
  • The model over-predicts this baby's birth weight.

• The Weightings

  • The weightings used in the WACC are ratios of the market values of various forms of debt and equity used in a company's financing.
  • To calculate the weighted average cost of capital (WACC) we must take into account the weight of each component of a company's capital structure.
  • The "weighting" varies based on how the company finances its activities.
  • If the value of the company's equity exceeds its debt, the cost of its equity will have more weight.
  • Define how a company's weighted average cost of capital is weighted

• Writing Formulas for Polymeric Macromolecules

  • HDPE is composed of macromolecules in which n ranges from 10,000 to 100,000 (molecular weight 2*105 to 3 *106 ).
  • Because of this, polymer molecular weights are usually given as averages.
  • Two experimentally determined values are common: Mn , the number average molecular weight, is calculated from the mole fraction distribution of different sized molecules in a sample, and Mw , the weight average molecular weight, is calculated from the weight fraction distribution of different sized molecules.
  • Since larger molecules in a sample weigh more than smaller molecules, the weight average Mw is necessarily skewed to higher values, and is always greater than Mn.
  • As the weight dispersion of molecules in a sample narrows, Mw approaches Mn, and in the unlikely case that all the polymer molecules have identical weights (a pure mono-disperse sample), the ratio Mw / Mn becomes unity.

• Mass

  • At its 2011 meeting, the General Conference on Weights and Measures (CGPM) agreed that the kilogram should be redefined in terms of the Planck constant.
  • In everyday usage, the mass of an object in kilograms is often referred to as its weight.
  • In scientific terms, 'weight' refers to the gravitational force acting on a given body.
  • For example, a person's weight on the Earth is different than a person's weight on the moon because of the differences in the gravitational pull of each body.
  • Accordingly, astronauts in microgravity must exert 10 times more force to accelerate a 10-kg object at the same rate as a 1-kg object, even though the differences in weight are imperceptible.

• Weighted Average Cost of Capital

  • The WACC is the cost of capital taking into account the weights of each component of a company's capital structure.
  • The weighted average cost of capital (WACC) is the rate a company is expected to pay, on average, to its security holders.
  • Stated differently, the return on capital of a new project must be greater than the weighted average cost of capital.
  • Since companies raise money using any number and combination of these sources - i.e. debt, common stock, preferred stock, retained earnings - it is important to calculate the cost of capital taking into account the relative weights of each component of a company's capital structure.

• Log Transformations

  • Both graphs plot the brain weight of animals as a function of their body weight.
  • The raw weights are shown in the upper panel; the log-transformed weights are plotted in the lower panel.
  • Scatter plots of brain weight as a function of body weight in terms of both raw data (upper panel) and log-transformed data (lower panel).

• Portfolio Diversification and Weighting

  • Weighting is the percent allocation a particular investment type receives within a portfolio.
  • The idea of eliminating risk by spreading investments across pools of underlying stocks and bonds is called "diversification. " A diversified portfolio spreads investments across all asset classes with a weighting system that takes time frame and risk tolerance into account.
  • The "weight" is the proportion of that portfolio assigned to one category.

• Sensory Difference Thresholds

  • For example, consider holding a five-pound weight (the reference level), and then having a one pound weight added.
  • This increase in weight is significant in comparison to the reference level (a 20% increase in weight).
  • However, if you hold a fifty pound weight (the new reference level), you would not be likely to notice a difference if one pound is added.
  • This is because the difference in the amount of additional weight from the reference level is not significantly greater (2% increase in weight) than the reference level.
  • This is similar to adding only one pound of weight when you're holding 50 pounds.