Graham Hole, Research Skills 2012: page 1APA format for statistical notation and other things: Statistical abbreviations: ANCOVA Analysis of Covariance ANOVA Analysis of Varianceα alpha, the probability of making a Type 1 error in hypothesis testingβbeta, the probability of making a Type 2 error in hypothesis testingCI confidence intervald Cohen’s measure of effect sized’ d-prime (a measure of sensitivity, used in Signal Detection Theory)df degrees of freedomF F-ratio (used in ANOVA, ANCOVA and MANOVA)Fmax Hartley’s Fmax test value (a test for homogeneity of variance)H Kruskal-Wallis test valueHaAlternative hypothesisHo Null hypothesisHSD Tukey’s HonestlySignificant Difference LSD Fisher’s Least Significant Difference MANOVA Multivariate Analysis of Variance M (or 푋�) Mean (usually, the sample mean)MdnMedianMSMean SquareMSE Mean square errorμ mu, designating the population meann Number in subsample N Total number in samplens Not significantp Probability%Percentageσsigma, designating the population standard deviation (n version of the SD formula)r Pearson's correlationr2 coefficient of determinationR multiple correlations (or σn-1) sample standard deviation (n-1 version of the SD formula)s2 sample variance (n-1 version)rs Spearman’s rhoSD Standard deviationSE (or SEM)Standard error SS Sum of Squares
Graham Hole, Research Skills 2012: page 2Other commonly used abbreviations : °C Degrees Centigrade cm Centimetre(s)°F DegreesFahrenheitg Gram(s)h Hour(s) IQ IntelligenceQuotientkg Kilogram(s) km Kilometre(s)kph Kilometres per hourL Litre(s)m Metre(s)m² Squaremetre(s) mg Milligramme(s)min Minute(s)mlMillilitre(s)mm Millimetre(s)ms Millisecond(s)RTReaction Times Second(s)Jeffrey Kahn's guide to APA format is reproduced below. Find the original here:http://my.ilstu.edu/~jhkahn/apastats.html Reporting Statistics in APA StyleDr. Jeffrey Kahn, Illinois State UniversityThe following examples illustrate how to report statistics in the text of a research report. 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 pvalue within the text of a manuscript (unless the pvalue is less than .001). Please pay attention to issues of italics and spacing. APA style is very precise about these. Also, with the exception of some p values, most statistics should be rounded to two decimal places. t t-test valueT Wilcoxon test valueU Mann-Whitney test value x Horizontal axis on a graphy Vertical axis on a graphz z-scoreΣ SumΧ2 Chi square test value