r do the sd curve what is the empirical distribution of sd in r what is the standardization function in r if c is negative what is sd why use xscorex and ifelse in r? what is ccdf how do you get the c-like cdf how does a variable change in r what is the difference in sd and a what is the change of distribution in r? how to standardize a variable r how to get a variable with a negative distribution in r how to curve r variable what does zscorex xbar mean how to change the distribution of variables in r how to change the distribution of the variable a what is the empirical distribution for mu r curve changes what is how to find the distribution on a variable in r what is the standardized function of a variable