Quick Tip:
Given some vector or matrix "x"x <- c(1,2,2,2,3,4,5,6,7,8,9)
The following code returns the mode(s) temp <- table(as.vector(x))
# this line creates a table called "temp". The first row of "temp" is a sorted list of all unique values in the vector-or-matrix "x". The second row in "temp" counts how many occurrences of each value. So there's be "1" under the values 1,3,4,5,6,7,8 & 9. And a "3" under the value 2.
names(temp)[temp == max(temp)] #this returns the names of the values that have the highest count in temp's second row. Since the mode is the value(s) that occur most frequently in a vector or matrix, this line returns the mode.
[1] "2"
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