# Re: st: Juhn-Murphy-Pierce (1993)

 From "Ben Jann" <[email protected]> To [email protected] Subject Re: st: Juhn-Murphy-Pierce (1993) Date Tue, 28 Nov 2006 09:45:52 +0100

```It is absolutely okay to use weights with -jmpierce-. Simply apply the
weights while estimating the models that serve as input to -jmpierce-.
-jmpierce- will then pick up the weights and appropriately use them in
its calculations.
ben

On 11/27/06, Vora Nakavachara <[email protected]> wrote:
```
```

Hi All,

I'm trying to follow Juhn-Murphy-Pierce (1993)
wage decomposition and have some questions.

If the data I'm using is a survey data (labor force data)
and it has a weight (sampling weight) attached to each
observation, then when I do jmpierce do I need to care

I have read some literature but I don't seem to see anyone
(Maybe I'm missing something -- can you please point out
the literature that discuss it?)

Basically, if I want to calcuate p90-p10 of log wage of people
in 2000 (and 1995) -- and to describe it as a measure of inequality
of the country then I need to use weight, right?

So when I decompose how p90-p10 change from 1995 to 2000,
I should also consider weight?

But, (from the help file of jmpierce)

y1_i1 = x_i1b + F[-1](p_i1|x_i1) --- for year 2000
y1_i2 = x_i2b + F[-1](p_i2|x_i2) --- for year 1995

are "hypothetical" distributions, thus if I am to calculate p90-p10
(to be used in future steps of the decomposition) from these and
want to use weight then the weight attached to the observation i
wouldn't be correct anyway?

So should I just ignore the weight in the decomposition?
But what about when I want to discuss the summary statistics,
(as mentioned before) like p90-p10 inequality measure in 2000
then I believe the weight is important?

Thank you very much.

Vora N

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