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Within the econometric framework, studies employing propensity scores or instrumental variables (if good instruments can be found) may yield less biased estimates of the effects described here.
"Partly it's because they couldn't get good instruments.
Good writers must use good instruments, I thought.
"Good instruments can make all the difference in auditions," Ms. Borda said.
She said that she gets frustrated because the instrument often squeaks, and "you can't play right without good instruments".
Weather variables can make for good instruments because temperature, for example, can alter how much electricity people use to cool their homes and thus how many outages occur.
Similar(34)
But that's still a good instrument for a band of citizens to play.
"It's a good instrument, but she has great technique, and superstar, beautiful-human-being phrasing".
The loofah was a really good instrument with which to do that.
Hailed as one of today's leading dramatic sopranos, she does have the makings of a good instrument.
It may not even be a good instrument, because of the way it has amplified anonymous accusations.
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