Fip includes codes for Puerto Rico, the Virgin Islands, Guam (I think),
and one or two other geographic entities that are not states in the United
States. That accounts for the skipped numbers though, had I been
numbering, I might've also skipped thirteen. ;-)
Sam
On Wed, 24 May 2006, Scott Cunningham wrote:
> On May 24, 2006, at 11:54 AM, Rodrigo A. Alfaro wrote:
>
> > Scott,
> >
> > What is "fip" variable? state? where did you get 55? It seems this
> > variable
> > is highly correlated with others in the model. A quick inspection
> > could be
> > helpful: -xtsum rp srfm age2 hgc hhd1 fip-. Moreover, is this panel
> > balanced?
>
> Rodrigo,
>
> Thank you for your reply. I'll answer what I can.
>
> The panel is balanced (except for hhd1, as I hadn't noticed something
> before doing the xtsum [see below]). "Fip" is a state indicator
> variable, and while the number goes to 55, it skips some numbers for
> reasons only the Census knows so that it still totals to either 50 or
> 51 (I forget if DC is included separately). You say fip is highly
> correlated with others in the model. With other variables in the
> model? You may be right, as when I estimate the model without the -
> fip- variables, it does converge fine. Also, when I re-estimate the
> model with fixed effects with just year and fip, it has trouble
> converging. And this is perhaps due to the fact that there is some
> migration across time and state within my sample, but not much, as
> the individuals in the sample are relatively young and most live in
> the same state. Do you have any suggestions as to what I can do to
> overcome this? Also, OLS does work fine, making me wonder if I
> should be suspicious in light of what you said of those estimates.
>
>
> Variable | Mean Std. Dev. Min Max |
> Observations
> -----------------+--------------------------------------------
> +----------------
> rp overall | 3.113009 8.069344 0 99 | N
> = 2283
> between | 5.431478 0 44.66667 |
> n = 761
> within | 5.969858 -38.88699 67.11301 |
> T = 3
> | |
> srfm overall | 100.1544 11.52157 35.3187 243.9197 | N
> = 2283
> between | 8.116986 53.33359 172.0538 |
> n = 761
> within | 8.180396 46.42766 184.2222 |
> T = 3
> | |
> age2 overall | 308.8257 74.43039 169 529 | N
> = 2283
> between | 47.65699 227.6667 443.6667 |
> n = 761
> within | 57.1899 226.159 394.159 |
> T = 3
> | |
> hgc overall | 10.58826 1.852228 4 16 | N
> = 2283
> between | 1.33929 5.666667 14.66667 |
> n = 761
> within | 1.280086 7.254928 14.25493 |
> T = 3
> | |
> hhd1 overall | .2415459 .4281144 0 1 | N
> = 2277
> between | .3970831 0 1 |
> n = 761
> within | .1596349 -.4251208 .9082126 | T-
> bar = 2.99212
>
>
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