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Page "Econometrics" ¶ 18
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Heteroskedacity and .
Heteroskedacity can also be caused by changes in measurement practices.

occurs and when
A tangent point Q in the C-plane occurs when C and Af are tangent to one another.
Neoteny occurs when the animal's growth rate is very low.
; Lack-of-fit error: Error that occurs when the analysis omits one or more important terms or factors from the process model.
This occurs when the various factor levels are sampled from a larger population.
When scratched with a sharp implement, an exothermic reaction occurs and white fumes are given off as metallic antimony is formed ; when rubbed with a pestle in a mortar, a strong detonation occurs.
In The Plague, a key description of Oran occurs early, when it is explained that the town is built in such a way that it " turns its back on the bay, with the result that it's impossible to see the sea, you always have to go to look for it.
A significant episode occurs near the end of part IV, when Tarrou and Rieux sit on the terrace of a house, from which they can see far into the horizon.
In analog systems, it is difficult to detect when such degradation occurs.
Adiabatic heating occurs when the pressure of a gas is increased from work done on it by its surroundings, e. g. a piston.
Adiabatic heating also occurs in the Earth's atmosphere when an air mass descends, for example, in a katabatic wind or Foehn or chinook wind flowing downhill over a mountain range.
Adiabatic cooling occurs when the pressure of a substance is decreased as it does work on its surroundings.
Generally, an assault occurs when a person directly or indirectly applies force intentionally to another person without their consent.
The second fight between Ajax and Hector occurs when the latter breaks into the Mycenaean camp, and fights with the Greeks among the ships.
The concept occurs when a unit of meaning can vary in sound without changing meaning.
It occurs in several allomorphs depending on its phonological environment, assimilating voicing of the previous segment or inserting a schwa when following an alveolar stop:
In Hindu astrology the equinox occurs when the Sun is 6 degrees in Pisces.
* prevent overmodulation, and minimize it when it occurs
If, conversely, tin is used to coat steel, when a breach of the coating occurs it actually accelerates oxidation of the iron.
The fracture is adhesive or interfacial when debonding occurs between the adhesive and the adherent.
Shot noise is a type of electronic noise that occurs when the finite number of particles ( such as electrons in an electronic circuit or photons in an optical device ) is small enough to give rise to statistical fluctuations in a signal.
Viral induction of apoptosis occurs when one or several cells of a living organism is infected with a virus leading to cell death.
One of the most significant differences between the adversarial system and the inquisitorial system occurs when a criminal defendant admits to the crime.
** Spherical aberration, which occurs when light rays strike a lens or mirror near its edge
** Defocus aberration, which occurs when a system is out of focus

occurs and amount
While most elements are generally viewed as stable, a small amount of natural transformation of one element to another also occurs in the present time, through decay of radioactive elements as well as other natural nuclear processes.
Thus, a large amount of aggression occurs 5 – 15 minutes after a reunion.
When the upcurrent amount of sediment is less than the amount being carried away, erosion occurs.
Generally, with catenation comes the loss of the total amount of bonded hydrocarbons and an increase in the amount of energy required for bond cleavage due to strain exerted upon the molecule ; in molecules such as cyclohexane, this is referred to as ring strain, and occurs due to the " destabilized " spatial electron configuration of the atom.
Hypoxia also occurs in healthy individuals when breathing mixtures of gases with a low oxygen content, e. g. while diving underwater especially when using closed-circuit rebreather systems that control the amount of oxygen in the supplied air.
A " pharmacologic dose " of a hormone is a medical usage referring to an amount of a hormone far greater than naturally occurs in a healthy body.
Hyperinflation occurs when there is a continuing ( and often accelerating ) rapid increase in the amount of money that is not supported by a corresponding growth in the output of goods and services.
* Hot spot ( computer science ), region of a program where a significant amount of computation occurs
Potatoes are cross-pollinated mostly by insects, including bumblebees, which carry pollen from other potato plants, but a substantial amount of self-fertilizing occurs as well.
The amount of Rayleigh scattering that occurs for a beam of light depends upon the size of the particles and the wavelength of the light.
In modern times, it often occurs in a region following the industrialization of agriculture when fewer people are needed to bring the same amount of agricultural output to market and related agricultural services and industries are consolidated.
A fundamental observation leading to the development of quantum mechanics is that the energy levels of an electron around an atom does not vary continuously, but instead occurs in discrete quantum states called " orbitals ", each associated with an amount of energy.
A hand pay occurs when the amount of the payout exceeds the maximum amount that was preset by the slot machine's operator.
Such states tend to have a moderate to large amount of tourism or inter-state travel that occurs within their borders, allowing the state to benefit from taxes from people the state would otherwise not tax.
A " foul ", also known as a " scratch ," or missed jump, occurs when a jumper oversteps the takeoff mark, misses the pit entirely, does not use the correct foot sequence throughout the phases, or does not perform the attempt in the allotted amount of time ( usually about 90 seconds ).
Water and, to a lesser but still significant extent, ice, are also responsible for a large amount of sediment transport that occurs on the surface of the earth.
The absence of such a division in living amphibian species may be at least partly due to the amount of respiration that occurs through the skin in such species ; thus, the blood returned to the heart through the vena cavae is, in fact, already partially oxygenated.
Just like in common incineration, burning occurs, however controlling the amount of oxygen allowed proves to be significant to reduce the amount of harmful byproducts produced.
Some ground irrigation techniques involve the digging of channels on the land for the water to flow, whereas the use of center-pivot irrigation can reduce the amount of soil tillage that occurs and helps to reduce water runoff and soil erosion that can occur with ground irrigation.
In diabetes, it generally refers to an extra amount of insulin given in a single dose to cover an expected rise in blood glucose ( sugar ) such as the rise that occurs after eating.

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