When estimating this model it is crucial that: (i) both groups exhibit parallel trends, (ii) selection into treatment is conditionally random or at least not correlated with the outcome, and (iii) nothing else that affects the outcome variable occurs at the same time as the treatment timing.
And interest in health and religion usually occurs at the same time.
Derealization, or feelings of unreality concerning objects outside oneself, often occurs at the same time.
Perhaps... certain neural activity occurs at the same time as the sensation of redness, but they are fundamentally different things.
The controversy occurs at the same time as there are complaints the Chavez camp has clandestinely altered the country's new Constitution, which voters approved last December.
The odd part is that this shift toward value-free language occurs at the same time that many Americans have turned diversity into a form of worship.
Death still tends to be from cancer in the liver, but even if it occurs at the same time, it may be less painful, Dr. Harbour says.
When an approximant articulation occurs at the same time as another articulation is being made at a different place in the vocal tract, the approximant is said to form a secondary articulation.
When a stimulus, like an auditory tone, occurs at the same time as a painful or otherwise aversive event, the tone comes to be associated with the pain and thereby acquires the capacity to trigger a protective fear (defense) response on its own.
