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accuracy and precision simple english wikipedia the free encyclopedia jump to content main menu main menu move to sidebar hide getting around main page simple start simple talk new changes show any page help contact us about wikipedia special pages search search appearance give to wikipedia create account log in personal tools give to wikipedia create account log in contents move to sidebar hide beginning 1 related topics 2 different meanings of precision 3 related pages 4 references 5 other websites toggle the table of contents accuracy and precision 42 languages العربية azərbaycanca беларуская বাংলা català čeština чӑвашла deutsch english esperanto español eesti فارسی suomi français עברית हिन्दी magyar bahasa indonesia 日本語 қазақша 한국어 nederlands polski português română русский srpskohrvatski српскохрватски slovenčina slovenščina shqip српски srpski sunda svenska தமிழ் türkçe українська tiếng việt 文言 閩南語 bân lâm gí 粵語 中文 change links page talk english read change change source view history tools tools move to sidebar hide actions read change change source view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export make a book download as pdf page for printing in other projects wikimedia commons wikidata item appearance move to sidebar hide from simple english wikipedia the free encyclopedia accuracy how close results are to the true value precision the repeatability of measurements the accuracy and precision of measurements have special meanings in the fields of science engineering industry and statistics the accuracy of a measurement system is how close it gets to a quantity s actual true value 1 the precision of a measurement system is the degree to which repeated measurements give the same results 1 2 a measurement system can be accurate but not precise precise but not accurate neither or both for example if an experiment contains a error in the way it is done then increasing the sample size generally increases precision but does not improve accuracy the end result would be a consistent yet inaccurate set of results from the flawed experiment eliminating the systematic error improves accuracy but does not change precision a measurement system is valid if it is both accurate and precise related terms include bias non random or directed effects caused by a factor or factors unrelated to the independent variable and error random variability related topics change change source the terminology is also applied to indirect measurements that is values obtained by a computational procedure from observed data in addition to accuracy and precision measurements may also have a measurement resolution which is the smallest change in the underlying physical quantity that produces a response in the measurement different meanings of precision change change source the word precision also refers to how fine the measurement is made as the resolution of the measurement such as to the nearest meter centimeter or yard foot inch or nanometer in the case of full reproducibility such as when rounding a number to a representable floating point number the word precision has a meaning not related to reproducibility for example in the ieee 754 2008 standard it means the number of bits in the significand number of digits in the amount so it is used as a measure for the relative accuracy with which a number can be shown related pages change change source precision numbers significant figures pi references change change source 1 2 jcgm 200 2008 international vocabulary of metrology basic and general concepts and associated terms vim john robert taylor 1999 an introduction to error analysis the study of uncertainties in physical measurements university science books pp 128 129 isbn 0 935702 75 x other websites change change source the simple english wiktionary has a definition for accuracy and precision bipm guides in metrology guide to the expression of uncertainty in measurement gum and international vocabulary of metrology vim beyond nist traceability what really creates accuracy archived 2012 09 12 at the wayback machine controlled environments magazine precision and accuracy with three psychophysical methods guidelines for evaluating and expressing the uncertainty of nist measurement results appendix d 1 terminology accuracy and precision v t e machine learning evaluation metrics regression mse mae smape mape mase mspe rms rmse rmsd r 2 mda mad classification f score p4 accuracy precision recall kappa mcc auc roc sensitivity and specificity logarithmic loss clustering silhouette calinski harabasz davies bouldin dunn index hopkins statistic jaccard index rand index similarity measure smc simhash ranking mrr dcg ndcg ap computer vision psnr ssim iou nlp perplexity bleu deep learning related metrics inception score fid recommender system coverage intra list similarity similarity cosine similarity euclidean distance pearson correlation coefficient confusion matrix retrieved from https simple wikipedia org w index php title accuracy_and_precision oldid 10096800 categories critical thinking measurement hidden category webarchive template wayback links this page was last changed on 23 february 2025 at 18 26 page was rendered with parsoid text is available under the creative commons attribution sharealike license and the gfdl additional terms may apply see terms of use for details privacy policy about wikipedia disclaimers legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents accuracy and precision 42 languages add topic