By Joaquim P. Marques de Sá
Intended for a person wanting to use statistical research to a wide number of technological know-how and engineering difficulties, this booklet exhibits how you can use SPSS, MATLAB, STATISTICA and R for facts description, statistical inference, class and regression, issue research, survival facts and directional facts. The 2d version comprises the R language, a brand new part on bootstrap estimation tools and a more robust remedy of tree classifiers, plus extra examples and exercises.
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Additional info for Applied Statistics Using SPSS, STATISTICA and MATLAB
It is also possible to choose the starting point of the bins. With MATLAB one obtains both the frequencies and the histogram with the his t command. Consider the following commands applied to the cork stopper data stored in the MATLAB cork matrix: » » prt=cork ( : , 4) [f,x]=hist(prt,6); In this case the hist command generates an f vector containing the frequencies counted in 6 bins and an x vector containing the bin locations. 16. One can also use the his t command with specifications ofbins stored in a vector b, as hist (prt, b) .
The data can then be saved with Save As (File menu), specifying the data file name (Me teo . sav), which will appear in the title heading of the data spreadsheet. This file can then be comfortably opened in a following session with the Open option of the File menu. In MATLAB, one can also directly paste data from an EXCEL file, in a matrix definition typed in the MATLAB command window. For the meteorological data one would have (the " ... " denotes part of the listing that is not shown): » meteo= [ 181 143 36 39 3 7 114 132 35 39 36 101 125 36 40 38 14 70 35 37 39 l; % Pas ting starts here % and ends here.
In this section, we will present only the fundamentals of such operations, illustrated for the meteorological dataset. Imagine that we wanted a new variable, PClass, that categorised the maximum rain precipitation (variable Pmax) into three categories: 1. Pmax ~ 20 (low); 2. 20 < Pmax ~ 80 (moderate); 3. Pmax > 80 (high). Using STATISTICA we can add this new variable with the Add Variable option of the Insert menu. 6 will then be displayed, where we would fill in, namely, the number of variables to be added, their names and formulas used to compute them.
Applied Statistics Using SPSS, STATISTICA and MATLAB by Joaquim P. Marques de Sá