To avoid these risks, value - added models must fully control
for background variables that could be persistently associated with any teacher.
After controlling
for background variables such as family status and income, the researchers determined that each hour of lost sleep was associated with a 38 percent increase in the odds of feeling sad and hopeless, a 42 percent increase in considering suicide, a 58 percent increase in suicide attempts and a 23 percent increase in substance abuse.
Perinatal outcome index in planned home births and planned hospital births controlled
for background variables in low risk pregnancies
In multiparous women, perinatal outcome was significantly better for planned home births than for planned hospital births, with or without control
for background variables.
Research shows that after controlling
for background variables between AP and non-AP students, taking AP courses has very little impact on time to degree (Klopfenstein, 2010).
Not exact matches
In order to figure out why, the researchers ruled out a number of possibilities by controlling
for variables such as family
background and health.
This may be different in other countries, but it is not unexpected in the Netherlands, where home birth has been an approved option
for a long time.1 5 12 After
background variables were controlled
for, the perinatal outcome
for primiparous women with low risk pregnancies was similar
for those who planned home births and those who planned hospital births.
For instance, the family background variables we used to control for such differences may have failed to capture more nuanced variations in parental interest in educati
For instance, the family
background variables we used to control
for such differences may have failed to capture more nuanced variations in parental interest in educati
for such differences may have failed to capture more nuanced variations in parental interest in education.
Raymond and her team removed the family
background variables from the Quality Counts Chance -
for - Success Index to create a new index that includes only school - related factors.
There are a number of reasons: 1) student achievement probably wasn't used as the measure of teacher effectiveness; 2) before the advent of the modern computer, in the mid-1960s, some of the more sophisticated analyses were not feasible; 3) the structure and makeup of schools change, making the findings less applicable to the current situation; 4) most important, older studies may not control
for critical
variables, such as students»
backgrounds or past achievement.
Longitudinal studies and controlled studies —
for example, experimental or quasi-experimental studies that seek to eliminate the effect of extraneous
variables such as student
background — could establish causation.
Because the evidence on confounding by student
background variables is mixed, those who make decisions about teachers should allow
for its potential to occur.
One study,
for example, found that under value - added models that had very limited controls
for student
background variables, the two percent of teachers who had half or more students with disabilities received value - added scores that, on average, were low; they ranked in the 20th to 25th percentile in math and the 25th to 33rd percentile in reading.
Chetty might even agree with this assertion, although he would disagree with the EVAAS's (typical) lack of use of controls
for student
background variables / demographics — a point of contention that has been debated, now,
for years, with research evidence supporting both approaches; hence, the intense debates about VAM — based bias, now also going on
for years.
After controlling
for student
background, the only objective factor found to be positively correlated with student performance was smaller classes, not school size or teacher qualifications, nor any other
variable that the researchers could identify.
There are many
variables in this undertaking — beginning with your lifestyle and ending with a pure economic
background, like the sufficiency of funds
for keeping the kitten.
«Dimensions
Variable» also features the artist's hand - constructed frames, suggesting a threshold
for the subjects of the paintings to come forward, into «real life», as they visually oscillate between the foreground and
background of the illusionistic painting.
With the knowledge of today, we know that data from Giessen, Poona, Vienna,... are unreliable indicators
for background CO2 levels and all show a (
variable!)
These effects remained significant when controlling
for personal
background variables; importantly, the influence of question wording was not moderated by any of them (Fs < 1.13, ns,
for all interactions).
The noise criteria
for wind farms applied in Australia establish fixed noise limits
for low
background noise environments and
variable noise limits when
background noise levels are higher.
My conclusion: • There is no support
for a
variable TSI «
Background» • The current Climate Data Record [CDR] is not helpful to Climate Research • The CDR should not be based on obsolete solar activity data • I expect strong «push - back» from entrenched «settled science», but urge [at least] the solar community to be honest about the issue
247 pieces of information
for each case, roughly broken down into six categories: (1) identification
variables (e.g., citations and docket numbers); (2)
background variables (e.g., how the Court took jurisdiction, origin and source of the case, the reason the Court agreed to decide it); (3) chronological
variables (e.g., the date of decision, term of Court, natural court); (4) substantive
variables (e.g., legal provisions, issues, direction of decision); (5) outcome
variables
Married and not - married Hmong female high school students were compared on attitudinal, achievement, and
background variables to explore factors associated with early marriage and to determine consequences of early marriage
for mental health and educational expectations.
Moreover, this relation was evident while controlling
for many other important
background variables.
Multiple logistic regression analyses (Table 3) yielded the following results after controlling
for age, sex, race and ethnicity, and socioeconomic
background variables.
Therefore, the present study examines the long - term role of reckless driving - related movie exposure, while controlling
for important
background variables and also testing
for mediation processes.
Finally, although a large number of family
background variables were controlled
for in our analysis there may be many more that can impact on children's outcomes.
Mean levels of psychological well - being by parental status, controlling
for sociodemographic
background variables.
Background characteristics at study entry and descriptive statistics
for key
variables, by maternal controlling feeding profiles (n = 180) 1
Second, although we investigated sex and the presence of siblings, there may be other significant
background variables that differentiate among the trajectory groups, especially as potential risk factors
for the chronically low social skill group,
for example, parental income and education.