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 variance Viv Bewick 1 , ... mean of a variable is affected by different types and combinations of factors. One-way analysis of variance is the simplest form. It is an extension of the...

Ngày tải lên: 12/08/2014, 20:20

... regression analysis can be carried out that omits the constant [6]. Analysis of variance As stated above, the method of least squares minimizes the sum of squares of the deviations of the points ... ‘regression sum of squares’ and the unexplained sum of squares is referred to as the ‘residual sum of squares’. This partitioning of the total sum of squares can be present...

Ngày tải lên: 12/08/2014, 20:20

... a trial of intravenous nitrate (see Statistics review 3 [4]). A total of 50 patients were randomly allocated to the treatment group and 45 to the control group. The table shows the numbers of patients ... calculate the number of individuals we would get in each cell of the contingency table if the pro- portions in each category of one variable remained the same regardless of...

Ngày tải lên: 12/08/2014, 20:20

... for the sum of all values (X 1 , X 2 ,…, X n ). In other words: Review Statistics review 1: Presenting and summarising data Elise Whitley* and Jonathan Ball † *Lecturer in Medical Statistics, ... value. It is calcu- lated by summing all of the values in a dataset and dividing them by the total number of values. The algebraic notation for the mean of a set of n values (X 1 ,...

Ngày tải lên: 12/08/2014, 18:21

... all of these considera- tions must be addressed within the context of a number of confounding variables such as scenarios involving immediate and well performed bystander CPR or scenarios of chest ... timing of certain interventions in SOHCA is time dependent or, more accurately, dependent upon the duration and degree of the ischemic insult after the onset of VF. Although the ov...

Ngày tải lên: 12/08/2014, 20:20

... 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. The expected number of events at the time of an ... hypothesis, the risk of death (number of deaths/number alive) can be calculated from the combined data for both groups. Table 3 shows the calculation of the expected number of...

Ngày tải lên: 12/08/2014, 20:20

... reduction of cerebral perfusion to the point of causing ischemia [5,6]. Radiographic evidence of vasospasm develops in 50% to 70% of patients with SAH, but only half of those experience symptoms of ... at the time of surgical clipping of aneurysm. Two case series describing the use of such implants are of interest [158,159]. In one, Kasuya and colleagues report an incidenc...

Ngày tải lên: 13/08/2014, 03:21

... replications to obtain Bootstrap values, using PAUP software [23]. IFN-c was used as an outgroup in this analysis. Expression of the IL-10 gene Analysis of IL-10 gene expression in healthy tissues by RT–PCR. ... protocol: 1 lL of cDNA was mixed with 5 lL of dNTPs (10 l M of each dNTP), 10 · Gene Taq Universal buffer, 0.5 lLofTaq polymerase (5 UÆmL )1 ; Nippon Gene, Tokyo, Japan)...

Ngày tải lên: 20/02/2014, 02:21

... a tf-idf score of a word t i in a piece s j of document. w ij = tf ij ×  log m df i + 1  (3) In this formula, tf ij denotes the number of times the word t i occurs in a piece of text s j , and ... df i denotes the number of pieces in which the word t i occurs. As a unit of text piece s j , we consider 859 Table 3: Comparison of mean precision among the combinations of two co...

Ngày tải lên: 20/02/2014, 12:20

... the ENTREZ and BLAST software (National Library of Medicine and National Institute of Health, Bethesda, MD, USA). The PROSIS package (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)Geneticand biochemical analysis of the cysteinyl...

Ngày tải lên: 21/02/2014, 03:20