It has been observed that both breast cancer and prostate cancer are rarer near the equator and more prevalent toward the poles. This is a worldwide phenomenon. Some of the research done by Dr. St Hilaire, Rakesh Mandal, and others highlights this pattern and gives a plausible explanation (Mandal et al., 2009; St-Hilaire, 2010, 2011).
These biologists suspect that pollutants combined with meteorological conditions cause areas far from the tropics to collect pollutants. The nature of prostate cancer and breast cancer are such that both could be caused by certain pollutants known as endocrine disruptors.
Some of the work involves:
Each of these data sets indicates a way in which small sample sizes can be handled in the context of time series. Generally, time series analysis is based on large data sets, but reality does not always furnish large data sets. ...