Inaccurate age and sex data in the Census PUMS files: evidence and implications

We discover and document errors in public use microdata samples ("PUMS files") of the 2000 Census, the 2003-2006 American Community Survey, and the 2004-2009 Current Population Survey. For women and men ages 65 and older, age- and sex-specific population estimates generated from the PUMS files differ by as much as 15% from counts in published data tables. Moreover, an analysis of labor force participation and marriage rates suggests the PUMS samples are not representative of the population at individual ages for those ages 65 and over. PUMS files substantially underestimate labor force participation of those near retirement ages and overestimate labor force participation rates of those at older ages. These problems were an unintentional by-product of the misapplication of a newer generation of disclosure avoidance procedures carried out on the data. The resulting errors in the public use data could significantly impact studies of people ages 65 and older, particularly analyses of variables that are expected to change by age.Census ; Population ; Labor supply

Inaccurate Age and Sex Data in the Census PUMS Files: Evidence and Implications

We discover and document errors in public use microdata samples ("PUMS files") of the 2000 Census, the 2003-2006 American Community Survey, and the 2004-2009 Current Population Survey. For women and men ages 65 and older, age- and sex-specific population estimates generated from the PUMS files differ by as much as 15% from counts in published data tables. Moreover, an analysis of labor force participation and marriage rates suggests the PUMS samples are not representative of the population at individual ages for those ages 65 and over. PUMS files substantially underestimate labor force participation of those near retirement ages and overestimate labor force participation rates of those at older ages. These problems were an unintentional by-product of the misapplication of a newer generation of disclosure avoidance procedures carried out on the data. The resulting errors in the public use data could significantly impact studies of people ages 65 and older, particularly analyses of variables that are expected to change by age.Current Population Survey, American Community Survey, Census, disclosure avoidance, aging, data, sex, labor force participation, marriage

Evaluating the Effectiveness of Summer Day Camp in the Local Church as an Opportunity To Encourage Youth in Their Spiritual Growth, Church Identity, and Service

Problem Large amounts of time and effort are expended by youth directors in providing camp related opportunities for employment. It is widely hoped by these youth directors that the experience of being a camp staff person will increase spirituality among the staff, that it will strengthen their identification with the Seventh-day Adventist church, and that, in the future, these same staff members will desire more opportunities to serve in the mission of the church. The purpose of this project is to qualitatively study whether staff are affected positively or negatively in the ways mentioned above, by being staff members of Camp SonPower in the Ohio Conference during the summer of 2008. Method A study of the Scriptures was made to ascertain the attitudinal changes that young Bible heroes went through as a result of working in the service of God. Reference was made to the experience of early Adventist leaders who were themselves young when they started the Adventist church. Current literature was reviewed in the areas of leadership training and its intended and actual results. Literature in the theory of learning by doing was also reviewed. Special attention was paid to day camp operations and the literature available on staff training and the hoped-for outcomes for the staff. A survey consisting of three sections, one for each of the identified growth areas, was administered to the staff of Camp SonPower (a traveling, one-week day camp), at the beginning and at the end of the summer camping season in the Ohio Conference. The comparison of these surveys yielded the attitudinal changes that occurred in the staff after being a part of a Camp SonPower team for a summer. A staff training manual was created to prepare staff for their responsibilities. The training manual consisted of a leader’s guide, a staff training workbook, and a guide for the local church participating in Camp SonPower. Results The comparison of the two surveys (pre and post camp) revealed a variety of reactions and attitudinal shifts. There were some for whom being a staff member with Camp SonPower was “just a job.” Others looked for and found the hand of God, grasped it, and consequently reported increased desire to continue working with Him. The creation of a staff manual for training SonPower staffers was a helpful tool in preparing the teams for their assignments. It provided clarity on mission, living conditions, job descriptions, and ideas for doing the work. This manual will be useful in replicating SonPower’s training experience elsewhere. Conclusion Providing Camp SonPower not only aids the local church in its efforts to reach out to children and young families, it also provides a summer job for some of the older young people in the church. The hand of God can be seen influencing the lives and attitudes of SonPower staff members who are open to Him. It has to be more than money that staff members are after if they want to see changes in their lives. Their attitude at the beginning most often will determine what they get out of the experience of being a staff member in a day camp like SonPower

An Improbable Solution to the Underluminosity of 2M1207B: A Hot Protoplanet Collision Afterglow

We introduce an alternative hypothesis to explain the very low luminosity of the cool (L-type) companion to the ~25 M_Jup ~8 Myr-old brown dwarf 2M1207A. Recently, Mohanty et al. (2007) found that effective temperature estimates for 2M1207B (1600 +- 100 K) are grossly inconsistent with its lying on the same isochrone as the primary, being a factor of ~10 underluminous at all bands between I (0.8 um) and L' (3.6 um). Mohanty et al. explain this discrepency by suggesting that 2M1207B is an 8 M_Jup object surrounded by an edge-on disk comprised of large dust grains producing 2.5^m of achromatic extinction. We offer an alternative explanation: the apparent flux reflects the actual source luminosity. Given the temperature, we infer a small radius (~49,000 km), and for a range of plausible densities, we estimate a mass < M_Jup. We suggest that 2M1207B is a hot protoplanet collision afterglow and show that the radiative timescale for such an object is >~1% the age of the system. If our hypothesis is correct, the surface gravity of 2M1207B should be an order of magnitude lower than predicted by Mohanty et al. (2007).Comment: ApJ Letters, in press (11 pages

New Analysis Indicates No Thermal Inversion in the Atmosphere of HD 209458b

An important focus of exoplanet research is the determination of the atmospheric temperature structure of strongly irradiated gas giant planets, or hot Jupiters. HD 209458b is the prototypical exoplanet for atmospheric thermal inversions, but this assertion does not take into account recently obtained data or newer data reduction techniques. We re-examine this claim by investigating all publicly available Spitzer Space Telescope secondary-eclipse photometric data of HD 209458b and performing a self-consistent analysis. We employ data reduction techniques that minimize stellar centroid variations, apply sophisticated models to known Spitzer systematics, and account for time-correlated noise in the data. We derive new secondary-eclipse depths of 0.119 +/- 0.007%, 0.123 +/- 0.006%, 0.134 +/- 0.035%, and 0.215 +/- 0.008% in the 3.6, 4.5, 5.8, and 8.0 micron bandpasses, respectively. We feed these results into a Bayesian atmospheric retrieval analysis and determine that it is unnecessary to invoke a thermal inversion to explain our secondary-eclipse depths. The data are well-fitted by a temperature model that decreases monotonically between pressure levels of 1 and 0.01 bars. We conclude that there is no evidence for a thermal inversion in the atmosphere of HD 209458b.Comment: 8 pages, 5 figures; accepted for publication in Ap

Inaccurate age and sex data in the Census PUMS files: Evidence and Implications

We discover and document errors in public use microdata samples ( PUMS files ) of the 2000 Census, the 2003-2006 American Community Survey, and the 2004-2009 Current Population Survey. For women and men ages 65 and older, age- and sex-specific population estimates generated from the PUMS files differ by as much as 15% from counts in published data tables. Moreover, an analysis of labor force participation and marriage rates suggest the PUMS samples are not representative of the population at individual ages for those ages 65 and over. PUMS files substantially underestimate labor force participation of those near retirement ages and overestimate labor force participation rates of those at older ages. These problems were an unintentional by-product of the misapplication of a newer generation of disclosure avoidance procedures carried out on the data. The resulting errors in the public use data could significantly impact studies of people ages 65 and older, particularly analyses of variables that are expected to change by age

Single photon production by rephased amplified spontaneous emission

The production of single photons using rephased amplified spontaneous emission is examined. This process produces single photons on demand with high efficiency by detecting the spontaneous emission from an atomic ensemble, then applying a population-inverting pulse to rephase the ensemble and produce a photon echo of the spontaneous emission events. The theoretical limits on the efficiency of the production are determined for several variants of the scheme. For an ensemble of uniform optical density, generating the initial spontaneous emission and its echo using transitions of different strengths is shown to produce single photons at 70% efficiency, limited by reabsorption. Tailoring the spatial and spectral density of the atomic ensemble is then shown to prevent reabsorption of the rephased photon, resulting in emission efficiency near unity

A Search for Water in the Atmosphere of HAT-P-26b Using LDSS-3C

The characterization of a physically-diverse set of transiting exoplanets is an important and necessary step towards establishing the physical properties linked to the production of obscuring clouds or hazes. It is those planets with identifiable spectroscopic features that can most effectively enhance our understanding of atmospheric chemistry and metallicity. The newly-commissioned LDSS-3C instrument on Magellan provides enhanced sensitivity and suppressed fringing in the red optical, thus advancing the search for the spectroscopic signature of water in exoplanetary atmospheres from the ground. Using data acquired by LDSS-3C and the Spitzer Space Telescope, we search for evidence of water vapor in the transmission spectrum of the Neptune-mass planet HAT-P-26b. Our measured spectrum is best explained by the presence of water vapor, a lack of potassium, and either a high-metallicity, cloud-free atmosphere or a solar-metallicity atmosphere with a cloud deck at ~10 mbar. The emergence of multi-scale-height spectral features in our data suggests that future observations at higher precision could break this degeneracy and reveal the planet's atmospheric chemical abundances. We also update HAT-P-26b's transit ephemeris, t_0 = 2455304.65218(25) BJD_TDB, and orbital period, p = 4.2345023(7) days.Comment: 9 pages, 8 figures, Accepted for publication in Ap

Definition of a Security: Risk Capital and Investment Contracts in Washington

The addition of the risk capital definition to Washington\u27s securities law will expand regulation to many transactions that in the past were excluded. Although its full application is unforeseeable, the risk capital definition should apply to financing arrangements in the formation of clubs, associations, and cooperatives. Practitioners must be keenly aware that ventures not traditionally defined within Washington\u27s securities regulations many now fall under the risk capital definition of a security