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emilioalaca authored Mar 11, 2018
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PLS120Book2018.pdf
PLS120Book2018.tex
docs
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2 changes: 1 addition & 1 deletion 00.1_FrontMatter.Rmd
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url: 'http\://the book url goes here ******'
description: "Course materials for PLS 120. University of California, Davis"
---
##TEST EDIT JENNIFER BRAZEAL

## now it is a test re-edit by emilioL

# Front Matter {#ch.front}

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## Learning Objectives for Chapter

1. Pair symbols with corresponding concepts or definitions.
1. Express sums using summation symbol and expand sums defined with the summation symbol.
1. Calculate sum of squared deviations for a set of numbers.
1.

## Summation
## Deviations, sums of squares, sums of absolute deviations

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Remember the Pythagorean theorem? In a right triangle the square of the hypothenuse equals the sum of teh squares of the sides. This can be extended to a polyhedron with right angles everywhere. The square of a diagonal in 3D is the sum of the three sides of the polyhedron. This square is also the sum of the square of the bottom hypothenuse and the vertical side suared. ** Add figure with labels**

Imagine that we have a sample with 3 observations. Make a box where the lenght of each side is one of the observations and then consider the 3D diagonal. The sum of squares of the deviations is equal to the lenth of the diagonal
Imagine that we have a sample with 3 observations. Make a box where the lenght of each side is one of the observations and then consider the 3D diagonal. The sum of squares of the deviations is equal to the lenth of the diagonal.

The total sum of s

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