Unsplashのmartin bennieが撮影した写真
This post is following of above post.
Let's calculate difference between Y2016 and Y2015
Let's see a histogram of d2016
Then, let's calculate difference between Y2017 and Y2016
Let's make a histogram of d2017
The histogram of d2016 and the one of d2017 look very different.
I use t.test() function to check if there is siginificant difference between d2016 and d2017.
p-value is 0.2254, greater than 0.05. So the both averages are not statistically different.
I use wilcox.test() function to see there is statistically difference of distribution.
p-value is 0.005691, less than 0.05. It means d2016 and d2017 locations are statistically different.
Let's make a scatter plot.
Let's use cor.test to check there is statistically significant correlation between d2016 and d2017.
p-value is 0.05046, slightly greater than 0.05. I can't say there is statistically correlation between d2016 and d2017.
Let's do Monte Carlo simulation.
95% confidence interval is from -0.64 to 0.308. So, there is not statistically positive/negative correlation.
That's it. Thank you!
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