Should I use IQR or standard deviation? | Types of All Link to comment. . Where, Q3 = the 75th percentile value . Therefore, we do not know whether to use the mean and standard deviation or the median and interquartile range (IQR). Summarizing and presenting numerical data - Biochemia Medica Median The median (middle quartile) marks the mid-point of the data and is shown by the line that divides the box into two parts. Statistical Data Editing in Scientific Articles - PMC The interquartile range is calculated in much the same way as the range. the minimum, first quartile, median, third quartile and maximum with stats = "fivenum". I've just confirmed with the rockstar APA Style Experts that the format for reporting range statistics is, for example: range: 39-334 Note that the word "range" is not to be italicized (as opposed to, say, M or SD).I was initially concerned that the use of a dash would be problematic if the maximum value could potentially be negative, but Stefanie Lazer assured me that, "When typeset, negative . You will note that significance levels in journal articles--especially in tables--are often reported as either "p > .05," "p < .05," "p < .01," or "p < .001." APA style dictates reporting the exact p value within the text of a manuscript (unless the p Common Statistical Abbreviations and Symbols in APA (In italics) B. Interquartile Annual Tuition Ranges by Type of Institution and Degree Level. Window with variables will open. If Cannot Use Full Range • Three step logic (-1(e)(2)(iii)(B): - Increase reliability of result using "valid statistical method" - In general, such a statistical method is based on 75 percent probabilities - Interquartile range generally deemed a sufficient approximation to the 75 percent probabilities, though other method could be used