### ratio | efficiency:

Reproductive efficiency
* is always a challenge in high producing herds
  - where hair sheep truly excel
* relies on using all resources available.

Resource efficiency
* is an essential foundation of sustainability.
* way to achieve a level of sustainability in our resource consumption.

Thermal efficiency
* is also a prime consideration in the development of new generation systems
  - used to evaluate wood-conserving stoves and numerous other devices
* keeps the outdoors where it belongs.
* measure of the performance of a heat engine.

Employee turnover
* are ratios.
* is expensive in terms of time and capital
  - widespread in nursing homes
* represents a loss of assets - an uncovered loss.

Gear ratio
* are infinitely variable from full speed reverse to full speed forward
  - ratios
* can also determine how much fuel the car uses.
* is the number of times the spool rotates for each handle turn.
* provide proper balance between weight-moving ability and speed of movement.

### ratio:

Gross margin
* are the excess of revenues above the cost of goods sold.
* compare pricing power to the manufacturing cost of doing business.
* is calculated by dividing gross profit dollars by sales dollars
  - subtracting direct costs form gross income
  - how much a company keeps from revenue before paying overhead
* is the difference between net sales and the cost of goods sold on the income statement
  - the farm's sales and the variable operating expenses
* measure of the basic profitability and costs of a company's core business.

Load factor
- the amount of freight or passengers carried compared to capacity
* is the ratio of the average to peak loads
  - what percentage of seats are filled
* measures the portion of an airline's seats that are filled with paying passengers.

Odds ratio
* are a way of examining the likelihood of an event or behavior
  - invariant when the orientation of the rows and columns reversed
* refers to the chance of an event versus the chance of a non-event.

Profit margin
* are also an expression of the amount of competition inherent in the business
  - often razor sharp in a global economy
  - the money left over after paying all of the costs of running the business
* change slowly over time, particularly in an extended business cycle.
* is determined by dividing net income by revenue
  - by total revenues for that period
* measure of how efficiently the business is operating.

### ratio:

Proportion
* also plays a large role in the human perception of beauty.
* are a special type of ratio in which the denominator always includes the numerator
  - also useful measures of morbidity and mortality
  - equations containing ratios of equal value
  - fractions
* brings in other concepts such fractions, ratios, and equivalence.
* determine the optical qualities of the diamond.
* is an outcome of the division of one variable by another
  - magnitudes
  - one of the principles of art and design
  - placements
  - the relation of one object to another in size, amount, number or degree
* is the relationship between a facade's height and width
  - the various parts
  - of parts to the whole in terms of size
* means the ratio between the width and height of the image.
* plays an important role in development.
* refers to the angles and relative measurements of a polished diamond
  - relationship of the parts to each other
  - size of the upper body or trunk relative to the lower body or legs

### ratio | proportion:

Direct proportion
* is an important concept in both mathematics and science classes
  - the essence out of which linear functions grow
* lead to the study of lines or linearity.

Percent
* Covers the basics of converting fractions into percents.
* are decimal fractions.
* cover A densitometer is used to measure percent cover.
* is proportion