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  "body": "\n## Summary\n\nBlocking is the grouping of experimental units into blocks of similar units, with treatments compared within each block.\nVariation between blocks, such as differences between fields, days or batches of material, is then removed from the comparison of treatments.\nThis makes the comparison more precise.\nIt is the local control principle of [[design of experiments|2TE42ZWJ3E]], and is usually combined with [[randomization|734Q6Q51X7]] inside each block.\nThe randomized complete block design, Latin squares and balanced incomplete block designs are the standard block designs.\n\n## Explanations\n\n### L1 human\n\nTo compare three wheat varieties, a farmer has four fields of different quality.\nIf each variety got its own fields, a good field could make a poor variety look good.\nInstead, each field is split into three plots, and every variety is grown once in every field, in plots chosen at random.\nDifferences between fields then affect all varieties equally and cancel out of the comparison.\n",
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