We can't ever really know when a tweet has been "consumed" (to use Twitter's artless term) without access logs. However, we do have a few pieces of information that may help. Notably, retweets. Retweets are the currency of Twitter. They're a transaction; I've consumed this tweet and...
The t-test is the Student's t-test whose curve is approximately bell-shaped but due to lack of complete information, if the sample size is less and the parent population is unknown, the t-test is used. The t-test may be conducted for independent samples or for dependent ...
Still, one 2009 study found “continuing screening to age 79 (versus 69) results in a median increase in percent mortality reduction of 8 percent (range 7–11 percent) and 7 percent (6–10 percent) under annual and biennial intervals, respectively.” It should be noted that the same study...
To estimate this value from a set of projections, we use various mean square relationships. Again let m be the number of models and n the number of scenarios; xi,j is a projection for scenario i from model j, ̅x̅ is the mean of projections across all models and scenarios, ̅si...
CICE patients—71 children (mean age 15.1 years) as compared to CIAE patients (114 adults (mean age 28.61 years) were more likely to have VVI than DDD pacemakers. Differences in implant duration (7.96 vs 14.08 years) appeared to be most important, but procedure complexity and outcomes also ...
For the following scores, find the mean, median, and mode. Which would be the most appropriate measure for this data set? You may use Microsoft Excel data anlysis to compute these statistics. 2, 2, 0, 5,1, 4,1, 3, 0,...
Long history of use Susceptible to genetic variation and drug-drug interactions Only agent with proven efficacy in patients undergoing thrombolysis Questions regarding appropriate dosing Once-daily dosing CABG, coronary artery bypass graft; PCI, percutaneous coronary intervention; STEMI, ST elevation myocar...
When using the normal approximation to the binomial, we must apply the continuity correction. What is this and why do we need to use it? In statistical notation, how does x differ from X? Explain why a process can be out of control even though all the samples fall with...
If an ANCOVA is a refinement of an ANOVA, why not use it constantly and never use an ANOVA? What is the difference between a randomized ANOVA and a repeated measures ANOVA? Explain why you should use ANOVA instead of several t-tests to evaluate mean differences...
We take the mean distance to the closest elite school of each student’s peers (excluding that student’s distance) at the class level. Using student addresses in grade 6 and grade 8, we are also able to assess the mobility of students and households within this two-year period. 3.2. ...