excel vba - VBA writing code for standard deviation and Range -


i trying write function in vba calculate standard deviation , range of 3 numbers. if of numbers determined --- funtion should output --- answer. if 3 of them not --- standard deviation or range should calculated remaining number while ignoring --- number. numbers inputted user. here code have written range , standard deviation calculation. using built in excel ws function ignores inputs if not numbers able bypass tricky bit. visible have been unable code recognize when 3 --- register ---.

function calculate range -------------------------------

function range(paramarray observedvalues())

while observedvalues(i) = "---" range = "---" wend

    max = application.worksheetfunction.max(observedvalues)     min = application.worksheetfunction.min(observedvalues)      range = max - min

end function

functions calculate standard deviation (multiple attempts)

first attempt

function sd(observedvaluea, observedvalueb, observedvaluec, observedmean)

if observedvaluea = "---" , observedvalueb = "---" , observedvaluec = "---" sd = "---" end if

if observedvaluea <> "---"     = 1     x = observedvaluea - observedmean         else         = 0         x = 1 end if  if observedvalueb <> "---"     b = 1     y = observedvalueb - observedmean         else         b = 0         y = 1 end if  if observedvaluec <> "---"     c = 1     z = observedvaluec - observedmean         else         c = 0         z = 1 end if

sd = sqr((1 / (a + b + c)) * x ^ 2 * y ^ 2 * z ^ 2)

end function

second attempt

function sd(paramarray number_input())

while number_input = "---" sd = "---" wend sd = application.worksheetfunction.stdev(number_input)

end function

say 3 values compute sd of in a1:a3

function sd()     dim val variant     val = [stdev.s(if(not(isna(a1:a3)),a1:a3))]     if iserror(val)         sd = "---"     else         sd = val     end if end function

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