|
|
|
|
|
In R, loops are often not the most efficient way to do repetitive calculations. Rather than doing the calculations for each value of a variable it is much more efficient to organize the values of…
Copyright
I created all of this content
|
|
There are several different functions and methods available in R to
compute statistics or, more generally, apply functions to groups of
observations within a data set. The tapply() function is…
Copyright
I created all of this content
|
|
We continue to discuss data structures in R, this time focusing on arrays. An array is a generalization of a matrix with an arbitrary number of dimensions. We illustrate the structure with a three…
Copyright
I created all of this content
|
|
In this video I review the basic ideas of the one-way ANOVA, with emphasis on the model, including both common parameterizations of it: the effects version and the cell-means version. You should have…
Copyright
I created all of this content
|
|
In SAS, arrays provide a convenient way to refer to other variables via an index-able alias. This is convenient when you want to do the same operation on multiple variables in a data set. Having an…
Copyright
I created all of this content
|
|
This video provides a historical overview of the conflict between Israel and its neighbors.
Copyright
I created all of this content
|
|
|
|
|