Phyllis,
Well, ok. While I agree we need to aim these conversations in a more limited manor (eg blog), I cannot resist discussing data and its faults.
I simply would not use the data source in the previous emails, which gave rates of biking for only those who reported biking. That is not the best number to use here.
You asked for an estimated time of arrival of better data. .
It looks like Whites do bike more often than Blacks, and do walk more often than Blacks-- BUT NOT THAT MUCH.
I found this pattern in my 2001 NHTS data file for the Northeast, which included all the add-ons.
I wanted to cross check that with 2009 NHTS data for the entire country, and then break it down by Census Region.
So, based on a nationwide sample of over 306,000 observations, the Whites come it at .37 BIKE trips per week, while the Blacks are reported as .33 BIKE trips per week. Pretty damn close I would say. And not much variation by Region.
For the same 306,000 observations Whites appear with 4.26 WALK trips per week, while Blacks are reported at 4.19 WALK trips. Again, the similarity between the two groups is impressive, all in all. Not much variation by region, except that in the Midwest the rate for Blacks seems a bit higher than for Whites.
Of course, NHTS has been criticized for undercounting some groups..... but that simply should not effect RATES by category.
Thus, I would not spend much time on the subject of major differences between the two groups!
Hope this helps, and see you soon on whatever Internet communication mechanism you work out.
Matthew A. Coogan
Director, The New England Transportation Institute
| Census region |
Race |
|
Number of bike trips in past week |
Number of walk trips in past week |
| Northeast |
White |
Mean |
0.34 |
4.67 |
|
|
N |
38849.00 |
38849.00 |
|
Black |
Mean |
0.21 |
4.68 |
|
|
N |
1396.00 |
1396.00 |
|
Other |
Mean |
0.23 |
4.55 |
|
|
N |
2110.00 |
2110.00 |
|
Total |
Mean |
0.33 |
4.66 |
|
|
N |
42355.00 |
42355.00 |
| Midwest |
White |
Mean |
0.38 |
3.56 |
|
|
N |
30629.00 |
30629.00 |
|
Black |
Mean |
0.34 |
4.05 |
|
|
N |
791.00 |
791.00 |
|
Other |
Mean |
0.44 |
3.98 |
|
|
N |
933.00 |
933.00 |
|
Total |
Mean |
0.38 |
3.59 |
|
|
N |
32353.00 |
32353.00 |
| South |
White |
Mean |
0.36 |
4.41 |
|
|
N |
142274.00 |
142274.00 |
|
Black |
Mean |
0.34 |
4.15 |
|
|
N |
13439.00 |
13439.00 |
|
Other |
Mean |
0.40 |
3.52 |
|
|
N |
10744.00 |
10744.00 |
|
Total |
Mean |
0.36 |
4.33 |
|
|
N |
166457.00 |
166457.00 |
| Far West |
White |
Mean |
0.40 |
3.94 |
|
|
N |
51714.00 |
51714.00 |
|
Black |
Mean |
0.33 |
3.97 |
|
|
N |
1874.00 |
1874.00 |
|
Other |
Mean |
0.34 |
3.32 |
|
|
N |
11622.00 |
11622.00 |
|
Total |
Mean |
0.39 |
3.83 |
|
|
N |
65210.00 |
65210.00 |
| Total |
White |
Mean |
0.37 |
4.26 |
|
|
N |
263466.00 |
263466.00 |
|
Black |
Mean |
0.33 |
4.16 |
|
|
N |
17500.00 |
17500.00 |
|
Other |
Mean |
0.36 |
3.53 |
|
|
N |
25409.00 |
25409.00 |
|
Total |
Mean |
0.36 |
4.19 |
|
|
N |
306375.00 |
306375.00 |
Matthew A. Coogan
cooganmatt@aol.com
-----Original Message-----
From: Phyllis Orrick <phylliso@berkeley.edu>
To: erik.weber <erik.weber@dot.gov>
Cc: h+t--friends <h+t--friends@chrispy.net>
Sent: Fri, Apr 20, 2012 3:05 pm
Subject: [H+T--Friends] guys in white spandex cliche
Eric,
Those are great links. We'll be sure to post them on the TRBhealth website when we do our next update. People tend to forget that bikes were and are a major source of mobility for the poor. They were the original revolutionary form of transport in that they enabled working people stranded in the industrialized inner cities to escape to the healthier rural areas on their lone days off and WOMEN COULD POWER THEMSELVES WHEREVER THEY WANTED. HG Wells has a very sweet novella about a hapless shop clerk trying to win the heart of a woman cyclist. Lots of bruises and scrapes.
Too bad those stats are so old. Is there any eta for updated ones?
RITA rocks!
Phyllis
--
Communications Director
Safe Transportation Research and Education Center (SafeTREC)
University of California Transportation Center (UCTC)
Institute for Urban and Regional Development (IURD)