**Editing question to be more specific:**

I'm relatively new to statistics, and hoping I can get some help. The brilliance that is Stack Exchange has been immensely helpful in the past.

In my case, I have a bunch of data for the vocabulary of parents and their children. I want to test the correlation between the vocab size of children to the vocab size of their parents. There are different ways to calculate "vocab size," and I'd like to determine which method most strongly correlates child vocab to parent vocab. Here is a sample of my data:

```
Child Vocab Method 1    Parent Vocab Method 1   Child Vocab Method 2    Parent Vocab Method 2
0.160626116          0.118348938             0.693759899             0.742152507
0.120358694          0.118333458             0.694389147             0.7404324
0.115148036          0.103091141             0.636671881             0.750822137
0.098036288          0.123344877             0.692421132             0.757787103
0.182142187          0.116444253             0.684319515             0.723742968
0.165819982          0.155696351             0.699473063             0.757061947
0.108361775          0.164021164             0.649796093             0.767774552
0.122965306          0.163835682             0.672889844             0.79362656
0.128326546          0.148130042             0.666237275             0.758969757

```

Thanks so much