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20 2 Data structuresThe factor Amount, however,has both labels and non-standardlevels. To see these, we put thecursor into one of thespreadsheet cells in the Amountcolumn, and click on the Editlevels and labels sub-option ofthe Factor option of the Spreadmenu, as shown in Figure 2.4.Figure 2.4Figure 2.5The levels are 0, 1 and 2, matching the descriptions given by the labels (see Figure 2.5).GenStat uses the labels in printed output, and the levels for calculations.Variates and factors are two of GenStat's vector data structures. The third is the text,which is a list of textual strings. To show a text, we can use the Change Sheet or Columnmenu to convert Fumigant into a text.To open the menu, weclick on the Convert suboptionof the Columnoption of the Spreadmenu, as shown inFigure 2.6.Figure 2.6