Báo cáo khoa học: " Statistics review 9: One-way analysis of variance" pptx

... samples.In one-way analysis of variance, the same principle is used,with variances rather than standard deviations being used to Review Statistics review 9: One-way analysis of varianceViv Bewick1, ... mean of avariable is affected by different types and combinations of factors. One-way analysis of variance is the simplest form. Itis an extension of the independent samples t-test (see statistics review ... variance of a set of n values (x1, x2… xn)is given by the following (i.e. sum of squares divided by thedegrees of freedom):Where the sum of squares = and the degrees of freedom = n – 1Analysis...

Báo cáo khoa học: "Statistics review 7: Correlation and regression" pot

... regression analysis can becarried out that omits the constant [6]. Analysis of varianceAs stated above, the method of least squares minimizes thesum of squares of the deviations of the points ... ‘regressionsum of squares’ and the unexplained sum of squares isreferred to as the ‘residual sum of squares’.This partitioning of the total sum of squares can be presentedin an analysis of variance ... factors thataffect the level of ln urea.PredictionThe fitted value of y for a given value of x is an estimate of thepopulation mean of y for that particular value of x. As such itcan be used...

Báo cáo khoa học: "Statistics review 8: Qualitative data – tests of association" pot

... atrial of intravenous nitrate (see Statistics review 3 [4]). A total of 50 patients were randomly allocated to the treatmentgroup and 45 to the control group. The table shows thenumbers of patients ... calculate the number of individualswe would get in each cell of the contingency table if the pro-portions in each category of one variable remained the sameregardless of the categories of the other ... 47.9, 156 × (248/1706) = 22.7 Review Statistics review 8: Qualitative data – tests of associationViv Bewick1, Liz Cheek1and Jonathan Ball21Senior Lecturer, School of Computing, Mathematical...

Báo cáo y học: "Statistics review 1: Presenting and summarising data" pptx

... for the sum of all values (X1, X2,…, Xn). In other words: Review Statistics review 1: Presenting and summarising dataElise Whitley* and Jonathan Ball†*Lecturer in Medical Statistics, ... value. It is calcu-lated by summing all of the values in a dataset and dividingthem by the total number of values. The algebraic notation forthe mean of a set of n values (X1, X2, , Xn) is:(1)where ... simple picture of aset of data (dataset), but it is often necessary to further sum-marize quantitative data, for example for hypothesis testing.The two most important elements of a dataset are...

Báo cáo khoa học: "Clinical review: Reappraising the concept of immediate defibrillatory attempts for out-of-hospital ventricular fibrillation" pptx

... all of these considera-tions must be addressed within the context of a number of confounding variables such as scenarios involving immediateand well performed bystander CPR or scenarios of chest ... timing of certain interventions inSOHCA is time dependent or, more accurately, dependentupon the duration and degree of the ischemic insult after theonset of VF. Although the overall concept of ... 2Comparison of out -of- hospital ventricular fibrillation survival rates(successful hospital discharge) with defibrillation attempts providedfirst versus cases for which there was provision of 3 min of...

Báo cáo y học: " Statistics review 12: Survival analysis" ppt

... numbers of expected events.The total expected number of events for a group is the sum of the expected number of events at the time of each event. Theexpected number of events at the time of an ... hypothesis, the risk of death (number of deaths/number alive) can be calculatedfrom the combined data for both groups. Table 3 shows thecalculation of the expected number of deaths for treatmentgroup ... where n is the totalnumber of events.The test statistic is compared with a χ2distribution with 1degree of freedom. It is a simplified version of a statistic thatis often calculated in statistical...

Báo cáo khoa học: "Clinical review: Prevention and therapy of vasospasm in subarachnoid hemorrhage" pptx

... reduction of cerebral perfusion to the point of causing ischemia [5,6].Radiographic evidence of vasospasm develops in 50% to70% of patients with SAH, but only half of those experiencesymptoms of ... at the time of surgical clipping of aneurysm. Two case series describing the use of suchimplants are of interest [158,159]. In one, Kasuya andcolleagues report an incidence of DID of 6% when ... incidence of Review Clinical review: Prevention and therapy of vasospasm insubarachnoid hemorrhageSalah G Keyrouz and Michael N DiringerNeurology/Neurosurgery Intensive Care Unit, Department of Neurology,...

Tài liệu Báo cáo khoa học: Cloning, characterization and expression analysis of interleukin-10 from the common carp, Cyprinus carpio L. docx

... replications to obtainBootstrap values, usingPAUPsoftware [23]. IFN-c was usedas an outgroup in this analysis. Expression of the IL-10 gene Analysis of IL-10 gene expression in healthy tissues byRT–PCR. ... protocol: 1 lL of cDNA was mixed with 5 lL of dNTPs (10 lM of each dNTP), 10 · Gene Taq Universalbuffer, 0.5 lLofTaq polymerase (5 UÆmL)1; Nippon Gene,Tokyo, Japan), 5 lL of each gene speciﬁc ... structure and expression analysis investi-gated. This work will pave the way for further investigation of the biological function of this gene, and the probability of the presence of IL-10-related genes...

Tài liệu Báo cáo khoa học: "Word Vectors and Two Kinds of Similarity" pptx

... a tf-idf score of a word tiin a piecesj of document.wij= tfij×logmdfi+ 1(3)In this formula, tfijdenotes the number of timesthe word tioccurs in a piece of text sj, and ... dfidenotes the number of pieces in which the wordtioccurs. As a unit of text piece sj, we consider859Table 3: Comparison of mean precision among thecombinations of two corpora and two ... solution to Plato’s problem: The latent seman-tic analysis theory of the acquisition, induction, andrepresentationof knowledge. Psychological Review, 104:211–240.Douglas L. Nelson, Cathy L....

Tài liệu Báo cáo khoa học: Functional expression and mutational analysis of ﬂavonol synthase from Citrus unshiu pptx

... theENTREZandBLASTsoftware (National Library of Medicine and National Institute of Health, Bethesda,MD, USA). ThePROSISpackage (Hitachi, San Bruno, CA,USA) was used for the analysis of multiple ... and sequence analysis of the endogenous ligands.Biochemistry 35, 1981–1987.29.Durairaj,M.,Leskiw,B.K.&Jensen,S.E.(1996)Geneticandbiochemical analysis of the cysteinyl residues of isopenicillin ... desaturation of aliphatic chains or theoxidative cyclization and the hydroxylation of substrates[18–22], and depend on the one-, two- or four-electronreduction of molecular oxygen. Most of these...

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