cat_smd                 smd value for categorical variables
cat_table               DemoGraphic table for categorical variables
cont_smd                smd value for continuous variable.
cont_table              DemoGraphic table for continuous variables
demo_table              Demographic Table for continuous and
                        categorical variables
get_mean                Mean, var function
my.chi.sq               chi square test to get expected value and p
                        value
my.fisher               fisher exact test to get p value if any cell in
                        propotion table of expect value less than 5
mydocx                  write smd table or demographic table into docx
                        file
smd_ci                  Confident interval for smd
t.test.p.value          t.test to calculate p value
