The number of decimal places in the x and y axis label depends on how wide the range is.
.number_decimals_plot_axis(
PPV_NPV = "PPV",
Min_FP = 0,
Max_FP,
Min_FN,
Max_FN,
Min_Prevalence,
Max_Prevalence
)
.
.
.
.
.
[x] out of y prevalence of disease
x out of [y] prevalence of disease