Applied statistics: using SPSS, STATISTICA, MATLAB and R by Joaquim P. Marques de Sá

By Joaquim P. Marques de Sá

Meant for an individual desiring to use statistical research to a wide number of technological know-how and engineering difficulties, this ebook exhibits the best way to use SPSS, MATLAB, STATISTICA and R for information description, statistical inference, category and regression, issue research, survival information and directional facts. The second variation comprises the R language, a brand new part on bootstrap estimation equipment and a far better therapy of tree classifiers, plus extra examples and workouts.

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When specifying matrices in MATLAB one may use comma to separate column values and semicolon to separate row values as in: » x=[1, 2 ; 3, 4]; Matrices can also be used to define other matrices. Thus, the previous matrix x could also be defined as: » x=[[1 2] ; [3 4]]; » x=[[1; 3], [2; 4]]; One can confirm that the matrix has been defined as intended, by typing x after the prompt, and obtaining: x = 1 3 2 4 The same result could be obtained by removing the semicolon terminating the previous command.

A lot of papers and publications are plagued with the “computer dixit” syndrome when reporting statistical results. People tend to lose any critical sense even in such a risky endeavour as trying to reach a general conclusion (law) based on a data sample: the inferential or inductive reasoning. In the book of A. J. Jaffe and Herbert F. Spirer (Jaffe AJ, Spirer HF 1987) many misuses of statistics are presented and discussed in detail. These authors identify four common sources of misuse: incorrect or flawed data; lack of knowledge of the subject matter; faulty, misleading, or imprecise interpretation of the data and results; incorrect or inadequate analytical methodology.

10. The command window of MATLAB showing the list of available statistical functions (obtained with the help command). Note that MATLAB is case-sensitive. For instance, Betafit is not the same as betafit. The basic data type in MATLAB and the one that will use more often are matrices. Matrix values can be directly typed in the MATLAB console. For instance, the following command defines a 2×2 matrix x with the typed in values: » x=[1 2 3 4]; The “=” symbol is an assignment operator. The symbol “x” is the matrix identifier.

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