ANOVA Effects Calculation

Click the Calc. Effects button in the 1-Way ANOVA: Power Calculation Parameters dialog box or the Calculate Effects button in the 1-Way ANOVA: Sample Size Parameters dialog box to display the ANOVA Effects Calculation dialog box. In this dialog box, you enter hypothetical group means and the standard deviation common to all groups. STATISTICA automatically calculates the measures of overall effect necessary to calculate power. Alternatively, if you want to "think metric-free" about the problem, you can enter a standard deviation of 1 (the default value) and enter "standardized effects" in the Population Means box.

Spreadsheet. Use the options under Spreadsheet to create or open spreadsheets.

Create. Click the Create button to create a spreadsheet  with the current values of the means and Sigma.

Open. Click the Open button to display a standard file selection dialog box to open a previously saved spreadsheet with group means and Sigma. This spreadsheet should be one previously saved in this menu or formatted in the same style. The spreadsheet is opened in a separate window, and its contents are read into the appropriate boxes under Population Means and the Sigma field. If a spreadsheet with the inappropriate format is opened in this menu, unpredictable results occur.

The ANOVA Effects Calculation dialog box has an "automatic resizing" capability. If you open a spreadsheet whose number of groups is different from the number of groups currently specified, the grid in the Population Means box resizes automatically to the No. of Groups.

Clipboard. Use the options under Clipboard to copy values to or paste values from the Clipboard.

Copy. Click the Copy button to copy the group means and Sigma to the Clipboard.  

Paste. Click the Paste button to copy an array from the Clipboard to the group means. This function also has an "automatic resizing" capability, so that if the number of rows in the array on the Clipboard does not match the current size of the grid, the grid is resized automatically to accommodate the array.

Population Means. In the Population Means group box, STATISTICA displays a number of fields equal to the number of groups entered in the 1-Way ANOVA:Power Calculation Parameters dialog box. As you enter hypothetical group means into these fields, the Effect Measures are automatically updated and displayed.

Sigma. Enter a value for the population standard deviation in the Sigma box. Alternatively, you can "think metric free" by (1) entering a standard deviation of 1 in this field, and (2) entering values for the population means in standardized effect units.

Effect Measures. The Effect Measures group box presents measures of overall effects size that are recalculated automatically as means or Sigma are altered. These include RMSSE and f.