Internal function for computing the actual value for MDiD

1 2 3 |

`formla` |
The formula y ~ d where y is the outcome and d is the treatment indicator (d should be binary) |

`xformla` |
A optional one sided formula for additional covariates that will be adjusted for. E.g ~ age + education. Additional covariates can also be passed by name using the x paramater. |

`t` |
The 3rd time period in the sample (this is the name of the column) |

`tmin1` |
The 2nd time period in the sample (this is the name of the column) |

`tname` |
The name of the column containing the time periods |

`x` |
An optional vector of covariates (the name of the columns). Covariates can also be passed in formulat notation using the xformla paramter. |

`data` |
The name of the data.frame that contains the data |

`dropalwaystreated` |
How to handle always treated observations in panel data case (not currently used) |

`plot` |
Boolean whether or not the estimated QTET should be plotted |

`idname` |
The individual (cross-sectional unit) id name |

`probs` |
A vector of values between 0 and 1 to compute the QTET at |

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