Word equation is a statistical model expressed in words rather than numbers or mathematical notation (e.g., Thumb = Gender + other stuff); provides a way of representing relationships, real or hypothesized, in our data or in the DGP.
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unexplained variation
Unexplained variation is everything included in the "other stuff" part of a word equation.
intercept
Intercept is the value where a line intersects with the y-axis; the value of y when the x is 0; for example, in the equation for a line, y = mx + b, the y-intercept is represented by b.
gf_dhistogram()
The gf_dhistogram() function is very similar to the gf_histogram() function, however, the difference is that gf_dhistogram() will create a density histogram for a quantitative variable. This means it will show the percentage of cases for each value ...