The Shape of Data
Distribution  the pattern of values in the data, showing their frequency of occurrence relative to each other.
There are some plots that can be useful for showing the distribution of data
Histogram is useful to show distribution of data
 Bins: the intervals used in a histogram. The data must be separated into mutually exclusive and exhaustive bins
 Cutpoints: the values that define the beginning and the end of the bins
 Frequency: the count of the number of the data values in each bin
 The peaks in the distribution are called modes
We can group distributions according to the number of modes they have:
 unimodal  a distribution with one mode
 bimodal  with 2 peaks
 multimodal  more than 2 peaks
In R:
hist(..., breaks=10, ...) // histogram
Like a histogram, but smoothed
Types
There are many distributions:
 Uniform Distribution  equally spread without any mode
 symmetric
 the mean, median, and mode are all approximately the same.

 assymetric
 leftskewed
 the longer tail on the left side
 the mode is larger than the median which is larger than the mean
 rightskewed
 the longer tail on the right side
 the mode is less than the median which is less the mean

 with gap
See Also
Sources