Where is sem t

This article has been cited by other articles in PMC. Sir, Use of descriptive statistics is very common in articles published in various medical journals.

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Nagele P. Misuse of standard error of the mean SEM when reporting variability of a sample. A critical evaluation of four anaesthesia journals. Br J Anaesth. Basic and clinical biostatistics. Glantz SA. Philadelphia: McGraw-Hill; How to summarize data; pp. Lang TA. How to report statistics in medicine: Annotated guidelines for authors, editors, and reviewers. Philadelphia: American College of Physicians; Elementary statistics: A Problem Solving Approach.

UK: William Brown; Armitage P, Berry G. Statistical methods in medical research. Cambridge, MA: Blackwell Scientific; Fundamental concepts in statistics: Elucidation and illustration. It takes into account both the value of the SD and the sample size. This makes sense, because the mean of a large sample is likely to be closer to the true population mean than is the mean of a small sample.

With a huge sample, you'll know the value of the mean with a lot of precision even if the data are very scattered. It is expressed in the same units as the data. With large samples say greater than ten , you can use these rules-of-thumb:.

The multipliers are not actually 1. With small samples, and certainly when N is less than ten, those rules of thumb are not very accurate. Statistical computations can compute a standard error for almost any parameter computed from a sample of data.