[CTPP] estimating standard errors for 2000 CTPP data

[Ed Christopher]

Liang meant to post this to the whole list...
---------------------------
Hi, all

When we apply the methods to workplace tables, we don't have N, size of 
publication area.  A statistician from CB suggested it was best to just 
to use the Residence Population as the N as they had nothing else with 
which to base a calculation on.  This is not ideal method, as for some 
places, there are many more workers than total resident workers, such as 
D.C.

The same thing happens to the design factor.  As we don't have design 
factor for the workplace tables, we can only use factors from residence 
population.

Hope this helps.

Liang Long
Federal Highway Administration
Room 74-440
1200 New Jersey, SE
Washington, DC 20590
tel 202 366 6971
fax 202 493 2198
e-mail liang.long at dot.gov <mailto:liang.long at dot.gov>

Paul Reim wrote:
> I'm compiling some comparisons of 2006-08 ACS and 2000 Census data, and I'm
> looking for some guidance in estimating standard errors for 2000 CTPP
> tables. For the place of residence data, I have applied the estimation
> procedures outlined in the 2000 SF3 documentation:
> 
>     Unadjusted standard error:
>         SE(Y) = sqrt(5*Y*(1-Y/N)),
>     where N = size of publication area (total population) and Y = estimate
> of characteristic total
> 
> This value is then multiplied by a design factor determined by the state,
> sample rate and characteristic.
> 
> Are these methods also applicable to the workplace (CTPP part 2) tables? If
> so, what assumptions can I make about sample rates, and are the standard
> error design factors applicable to place of work statistics?
> 
> Any advice will be greatly appreciated.
> 
> 
> ----------------------------------------------------
> Paul Reim
> Chief Planner, Data Resources
> Central Transportation Planning Staff
> Boston Metropolitan Planning Organization
> 10 Park Plaza, Suite 2150
> Boston, MA 02116-3968
> 
> Phone: (617) 973-8132
> Fax:     (617) 973-8855
> 
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> ctpp-news mailing list
> ctpp-news at chrispy.net
> http://www.chrispy.net/mailman/listinfo/ctpp-news

-- 
Ed Christopher
708-283-3534 (V)
708-574-8131 (cell)

FHWA RC-TST-PLN
4749 Lincoln Mall Drive, Suite 600
Matteson, IL  60443