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We designed a case-control study with strict matching of variables including age, gender, diagnosis, date of admission and hospital size, and were therefore able to eliminate the confounding effects of these characteristics on medical expenses and utilization, and enhance comparability between the case and control groups.
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Comparing correlation coefficients of matching pairs of variables between clusters revealed differences predictive of life and death and disparate physiologic relationships depending on injury and resuscitation state.
It was a fittingly scrappy note on which to end a match of variable quality – one in which Lazio also had defender Diego Novaretti sent off with 10 minutes left to play.
Note that within each bucket, we can search for exact matches of variable-length strings using the binary search.
Some methods do not rely on a fixed word length k but allow for matches of variable length (Comin and Verzotto, 2012; Didier et al., 2012; Haubold et al., 2005; Ulitsky et al., 2006).
A well-known approach that uses word matches of variable length is the average common substring (ACS) method (Ulitsky et al., 2006), which calculates for each position i in one sequence the length of the longest substring starting at i and matching some substring of a second sequence.
To check the assumption that the information contained on the STINMOD records accurately reflected the economic status of those records on the 2003 SDAC they were matched with, the accuracy of the matching of these variables were checked.
We performed a univariate analysis by adjusting each variable for age at enrolment (< = 42 years and >42 years of age), in order to avoid any residual confounding due to the matching of the variables.
Our algorithm is no more domain-independent because of our weighting procedure of matching variables, and because of our names frequency based weighting.
For each case, control subjects were selected from a randomized subset of combination of matching variables without replacements.
While AIC and BIC do not give an absolute solution to the generalized optimal choice of the combination of matching variables, they help us to choose the best options among available variables.
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CEO of Professional Science Editing for Scientists @ prosciediting.com