In psychometrics, the Kuder–Richardson Formula 20 (KR-20) first published in 1937 is a measure of internal consistency reliability for measures with dichotomous choices. It is analogous to Cronbach's α, except Cronbach's α is also used for non-dichotomous (continuous) measures. It is often claimed that a high KR-20 coefficient (e.g., > 0.90) indicates a homogeneous test. However, like Cronbach's α, homogeneity (that is, unidimensionality) is actually an assumption, not a conclusion, of reliability coefficients. It is possible, for example, to have a high KR-20 with a multidimensional scale, especially with a large number of items.
Values can range from 0.00 to 1.00 (sometimes expressed as 0 to 100), with high values indicating that the examination is likely to correlate with alternate forms (a desirable characteristic). The KR-20 may be affected by difficulty of the test, the spread in scores and the length of the examination.
In the case when scores are not tau-equivalent (for example when there is not homogeneous but rather examination items of increasing difficulty) then the KR-20 is an indication of the lower bound of internal consistency (reliability).
Bastards of madness
Call out this prayer of vengeance
Speaking to enemies through these wounds of redemption
Tearing out their eyes with horror
Behold this chosen new devise
As the silence pleads this forgiveness
A senseless begging for absolution
Upon this entrance into oblivion
This fallen angel of defiance, destitute to isolation
Hold tight to liberation, in the form of reprisal
Project of this restored frame, in these pain filled alterations
This new threat of changing life restless in this completion
Powerless you crawl like pigs
Soon to be slaughtered
Suckling to a faith that you avidly hoped would save you all
These offerings will bring us our justice.
For these years of diluted lies
The answers to our freedom
The answer to the death of gods
These hands held into the sky so the dark
Winds can taste the blood of murder
As the blackest hearts obey thoughts of evil
Deathlorn rites, endure the lust for revenge
Surrender the state of embracement and release
This life from the dark interiors
Discomfort of this assisted torment is given in these regards
A scourge of awakening
Prisoned in the rites of blood
Bestowed with ancient plagues, we will forge a disease
Of rape upon your ideals
Within this lifeblood we will find the truths as blades
Slice open their necks
The answers to our freedom
The answer to the death of gods
Once reconstructed the swarm will digest
The souls of this imperfection
Sterilizing faith bringer has discharged
This assembly of this damnation
Burden me with your weak
Curse me with your sick
In blood filled walls I lie confined