Letting the cat out of the bag: The impact of respondent multitasking on disclosure of socially undesirable information and answers to knowledge questions

Previous research shows that a high proportion of respondents engage in other activities while answering surveys. In this study, we examine the effect of multitasking in reporting sensitive information and socially undesirable behavior (e.g., substance use, mental health, gambling) along with reporting of knowledge/awareness of publicly funded programs. The dataset comes from a dual-frame random digit dial telephone survey of adults in a Midwestern state (N = 1,761) who were asked about their attitudes and behaviors toward gambling and health-related behaviors. The results of the study reveal that nearly half of the respondents engaged in multitasking activities (46.9%). In addition, it was found that multitaskers disclosed more socially undesirable information and reported lower levels of knowledge than non-multitaskers. The implications of these findings and how they fit in with previous work are discussed

Investigating Respondent Multitasking and Distraction Using Self-reports and Interviewers’ Observations in a Dual-frame Telephone Survey

Previous research has shown that people often engage in other activities while responding to surveys and that respondents’ multitasking generally has no effect on indicators of data quality (e.g., item nonresponse, non-differentiation). One of the limitations of these studies is that they have mostly used selfreported measures of respondents’ multitasking. We build on prior research by combining self-reported measures of multitasking with interviewers' observations of respondents' distractions recorded after each interview. The dataset comes from a statewide dual-frame random digit dial telephone survey of adults in a Midwestern state (n = 1,006) who were queried on topics related to awareness of and attitudes toward STEM education. We found that multitasking was frequent (45.6%) and that respondents who reported engaging in other activities were described as distracted twice as often as those who did not report multitasking (38.3% versus 19.0%). In terms of data quality, respondents who were multitasking provided less accurate responses to a knowledge question. However, we found no evidence that distractions, assessed by interviewers, compromised data quality. The implications of the results for survey practices are discussed

The Impact of Advance Letters on Cellphone Response in a Statewide Dual-Frame Survey

Many studies have illustrated the effectiveness of prenotification letters to increase response rates for telephone surveys. However, most studies assessing the impact of advance letters have been carried out using landlines, so the evidence of the effectiveness of prenotification letters on cellphones is scarce. This is important because the proportion of cellphone numbers used in survey research continues to rise. In this study, we assess the impact of advance letters on response rates from a cellphone sample of a statewide dual-frame survey about perceptions of and experiences with healthcare. In a dual-frame telephone survey of a Midwestern state’s residents, half of cellphones with addresses were randomly assigned to receive advance letters (n = 600) and the other half (n = 600) did not receive prenotices. Cellphone results are similar to previous studies using landlines, showing a positive effect of advance letters on cellphone response and cooperation rates (9.1 and 10.3 percentage point gain, respectively). Despite this positive effect on responses, the letters seemed to affect the sample composition by increasing the presence of respondents who were white, with higher education and income. The impact of advance letters on calling effort varied; it reduced the number of call attempts needed to reach completions while increasing the attempts required that ultimately resulted in refusals. Implications of the results for the use of advance letters prior to calling cellphones in dual-frame telephone surveys are discussed

Predictors of Multitasking and its Impact on Data Quality: Lessons from a Statewide Dual-frame Telephone Survey

Previous research shows that people often multitask while talking on the phone. This raises concerns about the quality of data yielded by telephone surveys as multitasking might distract respondents, inducing satisficing behaviors. Although respondents’ multitasking behavior has aroused great interest in the literature, most studies are based on online surveys. In this study, we expand on prior research by analyzing data from a random dual-frame telephone survey of adults in a Midwestern state regarding their perceptions and experiences with healthcare (N = 2,132; of which 245 are from landlines and 1,887 from cellphones). We found that multitasking was frequent (53.3%), especially among older respondents, parents with children in the household, less educated individuals, and those interviewed at night. Despite having over half of respondents report multitasking, we found no evidence that self-reported multitasking reduced the quality of the responses. The implications of the results for survey practices are discussed

The Infrared Array Camera (IRAC) for the Spitzer Space Telescope

The Infrared Array Camera (IRAC) is one of three focal plane instruments in the Spitzer Space Telescope. IRAC is a four-channel camera that obtains simultaneous broad-band images at 3.6, 4.5, 5.8, and 8.0 microns. Two nearly adjacent 5.2x5.2 arcmin fields of view in the focal plane are viewed by the four channels in pairs (3.6 and 5.8 microns; 4.5 and 8 microns). All four detector arrays in the camera are 256x256 pixels in size, with the two shorter wavelength channels using InSb and the two longer wavelength channels using Si:As IBC detectors. IRAC is a powerful survey instrument because of its high sensitivity, large field of view, and four-color imaging. This paper summarizes the in-flight scientific, technical, and operational performance of IRAC.Comment: 7 pages, 3 figures. Accepted for publication in the ApJS. A higher resolution version is at http://cfa-www.harvard.edu/irac/publication

Recombination dynamics of a human Y-chromosomal palindrome:rapid GC-biased gene conversion, multi-kilobase conversion tracts, and rare inversions

The male-specific region of the human Y chromosome (MSY) includes eight large inverted repeats (palindromes) in which arm-to-arm similarity exceeds 99.9%, due to gene conversion activity. Here, we studied one of these palindromes, P6, in order to illuminate the dynamics of the gene conversion process. We genotyped ten paralogous sequence variants (PSVs) within the arms of P6 in 378 Y chromosomes whose evolutionary relationships within the SNP-defined Y phylogeny are known. This allowed the identification of 146 historical gene conversion events involving individual PSVs, occurring at a rate of 2.9-8.4×10(-4) events per generation. A consideration of the nature of nucleotide change and the ancestral state of each PSV showed that the conversion process was significantly biased towards the fixation of G or C nucleotides (GC-biased), and also towards the ancestral state. Determination of haplotypes by long-PCR allowed likely co-conversion of PSVs to be identified, and suggested that conversion tract lengths are large, with a mean of 2068 bp, and a maximum in excess of 9 kb. Despite the frequent formation of recombination intermediates implied by the rapid observed gene conversion activity, resolution via crossover is rare: only three inversions within P6 were detected in the sample. An analysis of chimpanzee and gorilla P6 orthologs showed that the ancestral state bias has existed in all three species, and comparison of human and chimpanzee sequences with the gorilla outgroup confirmed that GC bias of the conversion process has apparently been active in both the human and chimpanzee lineages

Breastfeeding in Bolivia – information and attitudes

BACKGROUND: The main objective of the present study was to investigate the relationship between the attitudes of the mother and her family towards breastfeeding and the actual feeding pattern in a Bolivian population. A second objective was to study the relationship between breastfeeding information, specified according to source and timing, and feeding pattern. METHODS: Cross-sectional interviews with 420–502 Bolivian mothers with an infant less than or equal to 1 year of age. Duration of exclusive breastfeeding, use of prelacteal food and/or colostrum were the main outcome measures. RESULTS: The attitudes of the mother, her partner (the infant's father) and the infant's grandmother towards breastfeeding did not influence the infant feeding pattern. Women who had received breastfeeding information from health care personnel before birth or on the maternity ward breastfed exclusively for a longer duration (adjusted p = 0.0233) and avoided prelacteal food to a greater extent (adjusted odds ratio (AOR) = 0.42; 95% confidence interval for adjusted odds ratio (95% CI AOR) = 0.23–0.72). Information from a doctor before birth or on the maternity ward was associated with less use of prelacteal food (AOR = 0.53; 95% CI AOR = 0.31–0.93), an increased use of colostrum (AOR = 3.30; 95% CI AOR = 1.16–9.37), but was not linked to the duration of exclusive breastfeeding (p = 0.1767). CONCLUSION: The current study indicates that breastfeeding information delivered by health care personnel in a non-trial setting may affect the infant feeding pattern including the use of prelacteal foods and colostrum. There was no evidence that the attitudes of the mother, or the infant's father or grandmother influenced actual feeding behavior. The lack of a "negative or neutral attitude" towards breastfeeding in the participants of the current study does, however, diminish the chances to link attitude to feeding behavior

The north-south tilt in the Australian Height Datum is explained by the ocean’s mean dynamic topography

Using geodetic and oceanographic data, we show that the apparent north-south slope between the Australian Height Datum (AHD) and the geoid is caused almost completely by the ocean’s time-mean dynamic topography (MDT). This is because the AHD was constrained to zero height at local mean sea level at multiple tide gauges around the Australian continent. Using MDT models and corrected leveling data, almost all of the apparent north-south slope can be removed from the AHD. An auxiliary observation is that a satellite-only MDT model based on only around one year of GOCE data generates results commensurate with geodetic, oceanographic and combined MDT models