blocking

(noun)

A schedule for conducting treatment combinations in an experimental study such that any effects on the experimental results due to a known change in raw materials, operators, machines, etc., become concentrated in the levels of the blocking variable.

Related Terms

Examples of blocking in the following topics:

  • MLA: Block Quotes

  • APA: Block Quotes

  • Chicago/Turabian: Block Quotes

  • Randomized Block Design

    • Block design is the arranging of experimental units into groups (blocks) that are similar to one another, to control for certain factors.
    • In the statistical theory of the design of experiments, blocking is the arranging of experimental units in groups (blocks) that are similar to one another.
    • An example of a blocking factor might be the sex of a patient; by blocking on sex, this source of variability is controlled for, thus leading to greater accuracy.
    • The general rule is: "Block what you can; randomize what you cannot. " Blocking is used to remove the effects of a few of the most important nuisance variables.
    • An example of a blocked design, where the blocking factor is gender.

  • Block Copolymerization

    • Several different techniques for preparing block copolymers have been developed, many of which use condensation reactions (next section).
    • The unquenched polymer has been termed a living polymer, and if additional styrene or a different suitable monomer is added a block polymer will form.

  • Chicago/Turabian: Block Quotations

    • In Chicago style, format quotations of more than five lines as block quotations.
    • However, if a quotation takes up more than five lines in your paper, you should format it as a block quotation rather than as a regular quotation within the text of a paragraph.
    • Most of the standard rules for quotations still apply, with the following exceptions: a block quotation will begin on its own line (skip a line before and after the block quotation), it will not be enclosed in quotation marks, and its in-text citation will come after the ending punctuation, not before it.
    • Each line of the block quotation should be indented from the left margin the same distance as the first lines of your regular body paragraphs.
    • And as with series and lists, to better visually distinguish a block quotation from the surrounding text, be sure to leave an extra (blank) line between the last line of the block quotation and the first line of the following paragraph.

  • APA: Block Quotations

    • In APA style, format quotations of more than 40 words as block quotations.
    • However, if you want to quote more than 40 words from a source, you should format the excerpt as a block quotation, rather than as a regular quotation within the text of a paragraph.
    • Most of the standard rules for quotations still apply, with the following exceptions: a block quotation will begin on its own line, it will not be enclosed in quotation marks, and its in-text citation will come after the ending punctuation, not before it.
    • The entire block quotation should be indented from the left margin the same distance as the first lines of your paragraphs (and the first line should not be further indented).
    • And as with series and lists, to better visually distinguish a block quotation from the surrounding text, be sure to leave an extra (blank) line between the last line of the block quotation and the first line of the following paragraph.

  • MLA: Block Quotations

    • In MLA style, format quotations of more than lines of prose or more than three lines of verse as block quotations.
    • However, if you want to quote more than four lines of prose (or three lines of verse) from a source, you should format the excerpt as a block quotation, rather than as a regular quotation within the text of a paragraph.
    • The entire block quotation should be indented one inch from the left margin.
    • As should the rest of your paper, a block quotation in MLA style should be double-spaced.
    • To better visually distinguish a block quotation from the surrounding text, be sure to leave an extra (blank) line both above and below your block quotation.

  • CONCOR

    • The third panel (the "Blocked Matrix") shows the permuted original data.
    • The result here could be simplified further by creating a "block image" matrix of the four classes by the four classes, with "1" in high density blocks and "0" in low density blocks - as in figure 13.15.
    • The goodness of fit of a block model can be assessed by correlating the permuted matrix (the block model) against a "perfect" model with the same blocks (i.e. one in which all elements of one blocks are ones, and all elements of zero blocks are zeros).
    • The block model and its image also provide a description of what it means when we say "the actors in block one are approximately structurally equivalent."
    • Actors in equivalence class one are likely to send ties to all actors in block two, but no other block.

  • Problem-Solving With Friction and Inclines

    • The motion of the block, therefore, may depend on the motion of the incline itself.
    • If the block is being pushed up the incline the friction force points down the incline.
    • If the block is being pulled down the incline, the friction force will hold the block up.
    • If the frictional force is equal to the gravitational force the block will not slide down the incline.
    • The block is said to be in equilibrium since the sum of the forces on it is 0.