An object that holds results from computing pre-test of the conditional parallel trends assumption

```
MP.TEST(
CvM = NULL,
CvMb = NULL,
CvMcval = NULL,
CvMpval = NULL,
KS = NULL,
KSb = NULL,
KScval = NULL,
KSpval = NULL,
clustervars = NULL,
xformla = NULL
)
```

- CvM
Cramer von Mises test statistic

- CvMb
a vector of bootstrapped Cramer von Mises test statistics

- CvMcval
CvM critical value

- CvMpval
p-value for CvM test

- KS
Kolmogorov-Smirnov test statistic

- KSb
a vector of bootstrapped KS test statistics

- KScval
KS critical value

- KSpval
p-value for KS test

- clustervars
vector of which variables were clustered on for the test

- xformla
formla for the X variables used in the test