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www.johnmyleswhite.com | ||
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www.rdatagen.net
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| | | | | Recently, we were planning a study to evaluate the effect of an intervention on outcomes for very sick patients who show up in the emergency department. My collaborator had concerns about a phenomenon that she had observed in other studies that might affect the results - patients measured earlier in the study tend to be sicker than those measured later in the study. This might not be a problem, but in the context of a stepped-wedge study design (see this for a discussion that touches this type of study design), this could definitely generate biased estimates: when the intervention occurs later in the study (as it does in a stepped-wedge design), the "exposed" and "unexposed" populations could differ, and in turn so could the outcomes. We might confuse an artificial effect as an intervention effect. | |
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yonahfreemark.com
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statsandr.com
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| | | | | Learn how to apply the Student's t-test by hand and in R in order to compare two independent or paired samples with known or unknown variances | |
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phil-stat-wars.com
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| | | VI. (June 25) BONUS MEETING: Power, shpower, severity, positive predictive value (diagnostic model) & a Continuation of The Statistics Wars and Their Casualties There will also be a guest speaker: Professor David Hand: "Trustworthiness of Statistical Analysis" Reading: SIST Excursion 5 Tour I (pp. 323-332; 338-344; 346-352),Tour II (pp. 353-6; 361-370), and... | ||
