pzfx files can only be of type “Column” or “XY”, depending on whether the “X” column is specified by x_col. When reading into R, column names with special formating are converted to regular strings.įor writing, because R data frames and matrices don’t support hierachical columns, the written out. Prism allows special formating of column names such as superscripts. In a cell survival experiment, cells are seeded. Some damaged cells may continue to function for a time, but if they do not reproduce, they are not counted as survivors. Thus, cell survival curves measure reproductive cell death. Note if strike_action="star" the entire table is converted to type character. A cell survival curve is a plot of the number of cells that survive to form colonies as a function of radiation dose. One can choose to delete these values with strike_action="exclude", keep them with "keep", or convert them to a trailing "*" (as they appear in Prism) with "star". To accommodate this, an option strike_action is available in read_pzfx. Prism allows user to exclude data by striking them out individual observations. To accommodate this, NAs are added if the columns are of different lengths. Prism does not require columns in a table to be of the same length. For example, trailing _MEAN, _SD, _N are added if subcolumns represent mean, standard deviation and number of observations. It tries to infer the subcolumn types and adds appropriate suffix accordingly. To accommodate this, read_pzfx automatically adds _1, _2 etc to the original column name to account for sub columns if they represent replicates.
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