Sentences with phrase «selection bias in»

This study is limited due to lack of a randomly assigned control group and lack of comparison between the RLH and TI - TAU group on most outcome measures, and possible selection bias in the RLH sample.

These design features prevented protocol subversion due to selection bias in enrollment that might occur with blocked randomization41; we also applied the Berger - Exner test42 to confirm this expectation.

Ron: [10:51] I think there's some selection bias in the sense of who's come to us.

Only those who are young and naive have any excuse for not knowing that there is rampant positive results and more importantly selection bias in most of science.

=========== Unfortunately Trenberth demonstrates selection bias in the quote, which is what separates an activist from a scientists.

First, most funds using these are subject to data mining and selection bias in their construction.

In order to circumvent the issue of selection bias in the case of mandatory retention policies like the one proposed for Michigan, recent studies have utilized a statistical approach that compares children who fall just above and just below the cutoff used to determine retention.

The results in Table 10 support the notion that the observational study design does a good job of controlling for selection bias in the evaluation of charter effects (or that there is not much selection bias in the first place).

Of course, there would be selection bias in terms of which teachers are willing to be participate in this sort of work, and other imperfections.

Importantly, our null effect estimates from the random experiment differ substantially from those found from an analysis of CPS data, raising concerns about the potential for selection bias in non-experimental estimates of returns.

My co-authors and I attempt to address this question of selection bias in a recent paper titled «Why do we find ourselves around a yellow star instead of a red star?»

«But human trials of sitagliptin have been limited to date because they have lacked important tools like a placebo arm and allocation concealment (in which researchers do not know what the next treatment allocation will be, further preventing selection bias in testing),» said Loomba.

The role of selection bias in comparing cesarean birth rates between physician and midwifery management

In one study, a protective effect of breast milk on blood pressure was observed when 26 percent of the original cohort were followed up at ages 13 — 16 years (15), but not when 81 percent were examined at ages 7.5 — 8 years (16), suggesting either the possibility of selection bias in the later follow - up or an amplification of the breastfeeding — blood pressure association (49).

Rapid changes in the characteristics of parents over time also could result in different selection biases in terms of which parents (both mothers and fathers) have children when married or when unmarried (for example, as the pool of parents having mediators), instability appears to be most important (with the worst outcomes found for children of unstable single or unstable cohabiting mothers).

Not exact matches

It uses an automated selection process designed to reduce bias in admissions.

In the early days, Goodman says his company's algorithms inadvertently created a selection bias, favoring applicants from a particular school.

With the passage in 1968 of federal legislation mandating decidedly lowered rent ceilings, court rulings limiting discretion in tenant selection, and pressure from the civil rights movement to put an end to racial bias in tenant selection and assignments, this percentage increased.

In addition, as I think has been mentioned already, the whole basis of taking a sample of twitter followers of 10 celebrities is a great example of selection bias.

Either there is a male bias in selection of authors, or women theologians who think feminism endangers Christian faith are rare.

Your graph on how much a client should bet in order to cover his fees is meaningless and is guilty of Ma's rule number 2; selection bias.

Then again the the selection of our midfield is left to our manager, who shows a biases to specific players, which leaves the team unbalance and not properly covered in various areas of the field.

I'm not sure why Taylor merited this selection, but given the club involved in the final, there were other options that would have taken away any but the kookiest claims of bias and impropriety.

It makes sense that this study does not have much validity if the only women who participated in the study were those who agreed to document their experiences based out of their own interest (self - selection bias) rather than a random sample that covered a diverse range of experiences.

The strengths of the study include the ability to compare outcomes by the woman's planned place of birth at the start of care in labour, the high participation of midwifery units and trusts in England, the large sample size and statistical power to detect clinically important differences in adverse perinatal outcomes, the minimisation of selection bias through achievement of a high response rate and absence of self selection bias due to non-consent, the ability to compare groups that were similar in terms of identified clinical risk (according to current clinical guidelines) and to further increase the comparability of the groups by conducting an additional analysis restricted to women with no complicating conditions identified at the start of care in labour, and the ability to control for several important potential confounders.

A randomised controlled trial would be the best way to tackle selection bias of mothers who plan a home birth, but a randomised controlled trial in North America is unfeasible given that even in Britain, where home birth has been an incorporated part of the healthcare system for some time, and where cooperation is more feasible, a pilot study failed.31 Prospective cohort studies remain the most comprehensive instruments available.

Although there is inherent selection bias and recall bias with questionnaires in general, the authors of this study attempted to reduce both of these factors.

Other strengths of the underpinning cohort study include high participation by midwifery units and trusts in England; the minimisation of selection bias through achievement of a high response rate and absence of self selection bias because of non-consent; and the ability to compare groups that were similar in terms of identified clinical risk.12 The economic evaluation was conducted according to nationally agreed design and reporting guidelines.15 26 Collection of primary unit cost data was thorough and accounted for regional differences in care patterns.

Previous studies of the effect of breastfeeding on morbidity among full - term infants have not always accounted for selection bias that may result if infants who are breastfed are inherently healthier than bottle - fed infants.22 In the current study, the VLBW infants» ability to breastfeed did not reflect better health status as both human milk and infant formula were provided via gavage feeding especially during early enteral feedings.

However, it is unclear to what extent self - selection has biased these studies, as men who remove themselves from a child's residence may differ in many unobserved ways from men who choose to remain.

Except for male sex, which was not a risk factor in study participants, the ORs obtained from participants were similar to those obtained from all eligible cases and controls, providing no evidence of a noticeable selection bias.

Although we could not find estimates of fan use in the US population, we examined the potential selection bias by evaluating characteristics associated with SIDS risks in study participants and nonparticipants in a previously published article.16 Using California birth certificate data, we compared the ORs for maternal age, maternal education, parity, birth weight, infant sex, and late initiation of prenatal care (> 5 months» gestation).

The Western Australian Pregnancy Cohort Study has been previously shown to represent the general Western Australian population.16 Mothers were enrolled in the study in mid-pregnancy (before any fetal outcomes were known), leaving little scope for selection bias.

The authors note the main limitation of their study was the selection bias inherent to voluntary registries and reflected in the high proportion of women receiving DMT.

That liberals are just as guilty of antiscience bias comports more with accounts of humans chomping canines, and yet those on the left are just as skeptical of well - established science when findings clash with their political ideologies, such as with GMOs, nuclear power, genetic engineering and evolutionary psychology — skepticism of the last I call «cognitive creationism» for its endorsement of a blank - slate model of the mind in which natural selection operated on humans only from the neck down.

Potential bias may arise even earlier in the hiring process, she and others note, before candidates even make it to the final selection round.

The authors point out that the literature has a number of methodological limitations, such as measurement and selection bias, and a restricted focus, in which the effects of a limited number of alcohol policies are considered without accounting for other alcohol policies.

This selection bias was reduced in couples where there was a higher risk of transmission.

The authors do acknowledge some limitations in their paper, specifically that it relied on self - reporting, and that a selection bias may have been caused by pregnant couples being more willing to respond than disappointed couples.

In some cases, such as in the selection of participants for studies on suicide, the bias in the original studies may have underestimated the association between access to firearms and suicide, because both study and comparison groups were recruited from health care settings where they may have been seeking treatment for suicidal planninIn some cases, such as in the selection of participants for studies on suicide, the bias in the original studies may have underestimated the association between access to firearms and suicide, because both study and comparison groups were recruited from health care settings where they may have been seeking treatment for suicidal planninin the selection of participants for studies on suicide, the bias in the original studies may have underestimated the association between access to firearms and suicide, because both study and comparison groups were recruited from health care settings where they may have been seeking treatment for suicidal planninin the original studies may have underestimated the association between access to firearms and suicide, because both study and comparison groups were recruited from health care settings where they may have been seeking treatment for suicidal planning.

Other healthcare claims database studies have been conducted looking at joint replacement in morbidly obese patients, but results have been inconsistent, most likely due to selection bias.

It seems the original author — someone King describes as highly cited — had mentioned in his methods section that he'd applied two statistical corrections to his data to account for a selection bias.

To prevent disparities in jury rulings, more attention needs to be placed on the pre-trial aspects of the jury selection process, such as minority underrepresentation and measuring bias in potential jurors.

The conclusion: Even when selection bias is corrected for, college still makes economic sense, and the benefits are larger in some areas of study than in others.

This shows up in Webber's analysis in the size of the selection - bias correction and how it changes between cohorts.

In April, an investigation at Rutgers University finally concluded that «substantial (clear and convincing) evidence exists that research fraud has occurred in several areas» including «biased selection of subjects who were to be included in the symmetry / asymmetry comparison groups so as to artificially obtain desired results.&raquIn April, an investigation at Rutgers University finally concluded that «substantial (clear and convincing) evidence exists that research fraud has occurred in several areas» including «biased selection of subjects who were to be included in the symmetry / asymmetry comparison groups so as to artificially obtain desired results.&raquin several areas» including «biased selection of subjects who were to be included in the symmetry / asymmetry comparison groups so as to artificially obtain desired results.&raquin the symmetry / asymmetry comparison groups so as to artificially obtain desired results.»

The authors note the main limitation of their study was the selection bias inherent to voluntary registries and reflected in the high proportion of women receiving DMT.

Researchers explained that this difference may be due, in part, to a selection bias where healthier patients were treated with surgery, and they underscored the need for a controlled clinical trial with matched patients receiving each treatment first - line to compare the efficacy of these therapies.

We show that in fact, so long as the disease is sufficiently polygenic, the selection coefficients of individual loci are insensitive to the fitness cost of the disease, and instead depend on the distribution of effect sizes and the degree of mutational bias toward increased disease liability.

In order to avoid a potential bias caused by selection of a particular referent subject, subject - specific SI maps from all the subjects are summarized as a weighted average, with the Jaccard index for each subject as the weight.