Simplified Z Scores

This function calculates the Z score for a given value, relative to the mean and standard deviation for a variable in a given data frame.

Usage

z.calc(df, var1, raw, tails = NULL)

Arguments

df

data frame to read in.

var1

the variable of interest for which the mean and standard deviations will be calculated.

raw

the desired raw score to compare with the mean and standard deviation of var1.

tails

to report a p-value (level of significance) for the reported Z score, user must select a desired number of tails (either tails = 1 for a one-tailed test, or tails = 2 for a two-tailed test). Default set to NULL, and does not report a p-value.

Value

This function returns the raw score, mean, and z-score for a given raw score.

Examples

data <- mtcars

z.calc(data,mpg,12)
#> Raw Score      Mean   Z Score 
#> 12.000000 20.090625 -1.342408