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Why does teffects psmatch number of observations not match number of treated + number of controls with 1 match per treated?
Why does teffects psmatch number of observations not match number of treated + number of controls with 1 match per treated?

My data have 200 treated units and 9,800 untreated units. When I run teffects psmatch using default options, the results show

Number of observations = 10,000
Matches: requested = 1
min = 1
max = 1

If I have 200 treated units, and each unit is matched with one control unit, shouldn't the number of observations be 400?

I am confused because I cannot tell how many observations are being used in the estimation of the average treatment effect.

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