st: Cragg Donald tests

[Karan Nagpal <karan.nagpal1@gmail.com>]

I'm trying to test the strength of my instruments, but not sure how to
interpret the Cragg-Donald IV values. I implemented ivreg2, and
received the following output:

Stock-Yogo weak ID test critical values:
10% maximal IV size             16.38
                                         15% maximal IV size              8.96
                                         20% maximal IV size              6.66
                                         25% maximal IV size              5.53

I'm not sure what I should be comparing these values to and how I can
use the "main output" to find the Cragg-Donald F statistic, which is
what stata advised.

Thanks,
Karan

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