Construction of frequency histograms of samples

To construct frequency histograms of samples in the main application form of STATISTICA it’s necessary to choose the function “Graphs”. In the window of this function we choose “2D graphs”, and in it – kind of graphical construction – “Histograms” – fig.1.10.

Fig. 1.10. Forms for the procedure of constructing frequency histograms

In the window “2D Histograms” task of attributes constructing histograms

§ In option “Quick” we set:

- after pushing the buttion “Variables” – the name of the data sample, which was given to her (ATTENTION! Only one sample!);

- in the window “Graph type” - “Regular”;

- on activated (stands dot) position “Сategories” – set the number of sites that will be broken range of values ​​of the sample (recommended 5 : 7);

§ In options “Additionally”:

- set in the window “Type of fitting ” the view – “Normal”.

- in the window “View type” we choose “Standard”.

After this press ОК.

Type frequency histogram approximation of the normal law distribution shown in Fig.1.11.

Fig.1.11.The result of constructing the frequency histogram

After performing last procedure is necessary to test the distribution belonging to other law. For the latter case, the in option "Advanced" must be set:

- in the window “View type” reserve “Standard”;

- in the window “Fitting type” use the program proposed various distributions.