My data name is w, which has num, int, factor variables, when I use str(w), the factor format of srt(w) output includes 'w/', namely, one of factor variable line is '$ drv: Factor w/ 2 levels "0", "1": 1 1 1 1 1 1 1 1... my question is : what dose the symbol '/' do here? and int num variables do not include the symbol. 'w' may be data name.
The symbols w/ is an abbreviation of "with". It is just a coincidence that it matches your data frame name. Here is the str() output of a data frame named DF. The factor Site has two levels.
str(DF)
'data.frame': 14 obs. of 3 variables:
$ Proportion: num 0.0874 0.7214 0.9726 0.4673 0.5928 ...
$ Salinity : num 0 0.2 0.5 1 3 5 10 0 0.2 0.5 ...
$ Site : Factor w/ 2 levels "MD","SQ": 2 2 2 2 2 2 2 1 1 1 ...
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Thank you! You solved my problem. 
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