Thus, in the aggregate, graduates were significantly more likely than
members of the comparison group to be female and members of a racial / ethnic minority group.
A major problem for the evaluation was the
lack of a comparison group, or baseline data, to measure what would have happened in the absence of income management.
The paper's conclusion that being a visible minority does not act as a barrier is likely premature and largely untested given the respective demographics of the school and the lack
of comparison groups from other schools.
First, the lack of ethnic diversity, relatively high socioeconomic status, oversampling of mothers, and
absence of a comparison group limit the generalizability of these results.
«External evaluators gathered and analyzed outcome data using a
variety of comparison groups and analysis techniques,» Stockard and Wood note.
Contrast was at the low
end of our comparison group (particularly the Surface Book 2 13, which is a standout performer here), and color gamut support was just average.
Limitations include nonrandomization of participants in all 3 studies, lack
of comparison group in Study 1, and length of follow - up.
However, the increase in the intervention group (0.38 points per year) was significantly lower than the
increase of the comparison group (1.83 points per year).
Limitations include small sample size, lack
of comparison group for follow - up, reliance on self - reported measures, and limited generalizability due to ethnicity of participants.
When compared with patients who were cooled immediately after arrival in the emergency room, the patients who were chilled sooner fared worse: Twenty - six percent experienced a second cardiac arrest before reaching the hospital, compared with 21
percent of the comparison group.
It is important to note that the approach that we are describing here for outcome - based continuous program improvement does not strive to achieve a high level of scientific rigor that would involve the
use of comparison groups or other strategies to determine whether the mental health services and consultation «caused» specific outcomes.
Some 17,478 of those diagnosed with atrial fibrillation had lost their partner as had 168,940
of the comparison group.
Limitations of the Global Registry study include its open label design and lack
of comparison group.
However, research on VR applications has important limitations including small numbers of patients and lack
of comparison groups.
The study showed that «Explore Learning members» improvement in maths was 30 % higher than
that of the comparison group after controlling for gender, age, year group and special educational needs.»
Dick Shultz makes some interesting comments about our study, the main criticism apparently being the lack
of a comparison group, and Dick makes some suggestions for how alternative «controls» could have been created.
The effect size of this difference is.81 and was computed by subtracting the mean
of the comparison group from the mean of the experimental group and dividing by the standard deviation of the comparison group (Cohen 1977).
The initial cortisol levels of the ABC group did not differ from
those of a comparison group of children from the general population.
Limitations include a lack
of comparison group and the subjected nature of satisfactory ratings across domains.
Limitations include the lack
of a comparison group and small sample size.
Limitations include the lack
of a comparison group, lack of structured diagnostic instruments, and possible biases on the clinician report measures.
Results indicate that, after training, the interaction training group scores were no longer lower than
those of the comparison group of mothers without mental retardation and were also significantly higher than the scores of the control group on all maternal positive interactions, child vocalizations, verbalizations, language, and social domains.
Limitations include nonrandomization of subjects, lack
of a comparison group, and lack of examination of possible nesting factors due to the multiple sites and therapists.
Limitations include lack
of comparison group and lack of follow - up.
Limitations include the small sample size, the lack
of a comparison group, and a comparatively small number of male adolescents who participated in the treatment.
Previous evaluations of the Home - Start program (Barnes et al. 2006; Frost et al. 2000) suffer from methodological problems such as lack
of a comparison group, and the sole reliance on parental self - reports as a source of information.
Sibling behaviour problem scores were similar to
those of a comparison group of normal children and significantly different from those of a comparison group of psychiatrically referred children.