There are some examples about statistic or r problems, hoping you can get answer from scripts.
Problem list:
1.chisq_sampling.r:
To answer the question that if the population is not normal distribution, will the sampling result be normal distribution?
2.ggplot_par.r:
The method to combine many ggplots in one plot.
3./R_ggplot2/:
The basic usage of ggplot2, scatter plot, mean, CI
4./ID_numerate/:
To numerate the repeated id and show them with a new column.