## using the dataframe previously defined

describe(df1[:X1])

# Summary Stats:
# Mean:           2.078711
# Minimum:        -0.229097
# 1st Quartile:   1.262696
# Median:         2.086254
# 3rd Quartile:   2.972752
# Maximum:        4.390025
# Length:         50
# Type:           Float64

## number of rows and columns of df_1
size(df1)
# (50, 4)
