Normal density plot shading between specifications
plots the standard normal density, shading the portion inside the specification
limits given by the two-element vector
p = normspec(
specs, and returns the
p of the shaded area. If
no lower limit, then set
spec has no upper limit, then set
Create a standard normal density plot, shading the portion inside the specification limits
p = normspec([-1,1])
p = 0.6827
Create a normal density plot, shading the portion outside the specification limits.
For example, consider a production process that fills cans of paint. The average amount of paint in any can is 1 gallon, but variability in the process produces a standard deviation of 2 ounces (2/128 gallons). Create a normal density plot, shading the portion corresponding to the probability that the cans will be filled under specification by 3 or more ounces.
p = normspec([1-3/128,Inf],1,2/128,'outside')
p = 0.0668
specs— Specification limits
Specification limits, specified as a two-element numeric vector. Set
–Inf if there is no
lower limit; set
there is no upper limit.
0(default) | scalar value
Mean of the normal distribution, specified as a scalar value.
sigma— Standard deviation
1(default) | positive scalar value
Standard deviation of the normal distribution, specified as a positive scalar value.
region— Shading region
Shading region, specified as either
'outside'. The function
normspec shades the region either
p— Probability of shaded area
Probability of the shaded area, returned as a nonnegative scalar value.
h— One or more chart line objects
One or more chart line objects, returned as a scalar or vector. These objects are unique identifiers that you use to query and modify properties of a specific chart line. For a list of properties, see Line Properties.