When comparing their evolution pattern with cross-correlation technique, one can expect to observe the following: From the last figure and with the help of the distribution of monthly car accidents in the municipalities E and I during the period 1900-1990 (figure), try to confirm the above three observations made about the two time-series.
Wiens has a Ph D in Physics, with a minor in Geology.
He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.
Let us suppose that two phenomena are strongly correlated, but with a time-lag between them or that two features are influenced by a same factor but with a different time response and speed.
Thus a simple correlation procedure that compares the two time-series values on a date-by-date basis will indicate a very low degree of correlation.
His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.
He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.