Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/11621#issuecomment-206566624
By the way, what do you think about providing methods to test if data are
available?
E.g.,
```
/** Indicates if [[coefficientStandardErrors()]] is available in this
summary */
def hasCoefficientStandardErrors: Boolean
```
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