I need to test if a certain value (e. g. the number of lung cancer patients) has changed over time (e. g. over the last 30 years). I want to observe time trends over the years – when did the numbers increase, when did they decrease, and what is the overall trend over time.
Before planning statistical tests you should obtain and organize your data.
For example you can use data from world cancer statistics annual report. For each year you calculate number of new
Cases by 1,000 population.
Then you organize it by year.
That will give you the incidence.
If you enter your annual data in an excel sheet and make a lineal graphic you will be able to see the trend without any further statistic.
Odds ratio is information about risk. It does not give the trend of a disease.
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