Basic definition of Visualizing Data|Data Science Tutorial
Frequency: The frequency of a data set is the number of times a certain outcome occurs.
Proportion: A proportion is the fraction of counts over the total sample. A proportion can be turned into a percentage by multiplying the proportion by 100.
Histogram: is a graphical representation of the distribution of data, discrete intervals (bins) are decided upon to form widths for our boxes. Adjusting the bin size of a histogram will compact or spread out the distribution.
Positive Skew: A positive skew is when outliers are present along the right most end of the distribution.
Negative Skew: A negative skew is when outliers are present along the left most end of the distribution.