Sentences with phrase «biased by correlation»

Because students and parents selectively chose schools, however, OLS estimates may be biased by correlation between school choice and unobserved variables related to ability, motivation, or family background.

Not exact matches

Finally, we investigate tentative correlations between host - star masses and planet candidate radii, orbital periods, and multiplicity, but caution that these results may be influenced by the small sample size and detection biases.

She used R (i.e., a free software environment for statistical computing and graphics) to simulate correlation scatterplots (see Figures below) to illustrate three unique situations: (1) a simulation where there are two indicators (e.g., teacher value - added and observational estimates plotted on the x and y axes) that have a correlation of r = 0.28 (the highest correlation coefficient at issue in the aforementioned post); (2) a simulation exploring the impact of negative bias and a moderate correlation on a group of teachers; and (3) another simulation with two indicators that have a non-linear relationship possibly induced or caused by bias.

The second scatterplot I ran to test how bias that only impacts a small group of teachers might theoretically impact an overall correlation, as posited by Audrey.

Most international ETFs are dominated by mega cap stocks, a bias that can tilt exposure towards energy and financials and result in a weak correlation to domestic consumption patterns in the target market.

I don't see why the large - scale systematic urban bias issue isn't best addressed by an estimate in the style of McKittrick — looking for residual correlation between regional economic activity and regional temperature anomaly — even for those who object to the specific implementation in that paper.

For that reason, the comparisons of observed and modelled series are done not only in terms of the coefficient of efficiency, which is affected by the presence of bias, but also in terms of the correlation coefficient, which by definition removes the effect of bias.

Probably if you did something besides ordering the top 30 by correlation (remember there is measurement error so the ordering is not accurate), you could get rid of bias, and end up with a measure that provides uncertainty bounds with it.

Saying two variables are highly correlated doesn't necessarily mean one is causing the other; both could be caused by a third, unidentified variable, or it could be a random correlation, or your dataset could be biased or simply too small.

Some studies have shown that co-sleeping increases the risk of sudden infant death syndrome (SIDS) and isn't recommended by the Consumer Product Safety Commission or the American Academy of Pediatrics, but proponents claim that studies into the correlation between co-sleeping and SIDS are flawed and biased.

The «too low» DZ correlations can be explained by parent - rating biases that either exaggerate the differences between DZ twins (contrast effects) or that inflate the similarity of MZ twins (assimilation effects), or by the presence of non-additive genetic variance.

However, the significant correlation obtained between maternal and paternal supportive strategies displayed during the Picture - book Task could indicate a bias of the observational design by inhibiting fathers» spontaneous behaviors.