1.
Exploratory Data Analysis
1.3. EDA Techniques 1.3.3. Graphical Techniques: Alphabetic 1.3.3.15. Lag Plot


Lag Plot  
Conclusions 
We can make the following conclusions based on the above plot of
200 normal random numbers.


Discussion  The lag plot shown above is for lag = 1. Note the absence of structure. One cannot infer, from a current value Y_{i1}, the next value Y_{i}. Thus for a known value Y_{i1} on the horizontal axis (say, Y_{i1} = +0.5), the Y_{i}th value could be virtually anything (from Y_{i} = 2.5 to Y_{i} = +1.5). Such nonassociation is the essence of randomness. 