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Mean, Mode , Median fuctions

I found a program at a vb website that did several statisical calculations including Mean(average), Mode and median.  I am tring to make a simple program for my kids to check their homework.  I have a form with a textbox to enter a set of numbers, which then are added to listbox(one at a time) and once the user clicks the calculate button in three different textboxes are displayed the Mean the(the average of the numbers) and the mode ( the number that appears the most), and in the last textbox the median the number that is the middle number of the set.

example:  10, 10, 15, 17, 20, 25

Mean = 16.16            10 +10+15+ 17+20+25=  97/ 6 = 16.16
Mode=  10                 10 , 10 (2 10's)
Median = 16               10, 10, 15  (16) 17, 20 ,25 on even numbers you take the 2 middle number, add them together then divide by 2, odd set of numbers it is the middle number.

Is there any built in functions  for these, or how would I go about in creating them.

Thanks.........
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ucla11
Asked:
ucla11
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1 Solution
 
bingieCommented:
Try these for the mean and the median, just pass the name of the filled listbox to the function:

Private Function median(lstBox As Control)
If lstBox.ListCount Mod 2 = 1 Then
    lstBox.ListIndex = (lstBox.ListCount / 2) - 0.5
    median = lstBox.Text
    Exit Function
Else
    lstBox.ListIndex = (lstBox.ListCount / 2) - 1
    sum = Val(lstBox.Text)
    lstBox.ListIndex = lstBox.ListIndex + 1
    sum = sum + Val(lstBox.Text)
    median = sum / 2
End If
End Function

Private Function mean(lstBox As Control)
Dim sum As Long

For i = 0 To lstBox.ListCount - 1
 lstBox.ListIndex = i
 sum = sum + Val(lstBox.Text)
Next
 mean = sum / i
End Function

'Call it a-la

myMean = mean(List1)
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bingieCommented:
My original post, cleaned up a bit. Check out the second of Mikal613s link, it has a good function for Mode.

Private Function median(lstbox As Control)
Dim sum As Long

If lstbox.ListCount Mod 2 = 1 Then
    lstbox.ListIndex = (lstbox.ListCount / 2) - 0.5
    median = lstbox.Text
Else
    x = (lstbox.ListCount / 2)
    sum = Val(lstbox.List(x - 1)) + Val(lstbox.List(x))
    median = sum / 2
End If
End Function


Private Function mean(lstbox As Control)
Dim sum As Long

For i = 0 To lstbox.ListCount - 1
 lstbox.ListIndex = i
 sum = sum + Val(lstbox.Text)
Next
 average = sum / i
End Function
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ucla11Author Commented:
bingie , I like your code, do have a similair one for Mode?  also what if there is more than one number as mode
example:  10, 10, 12, 12, 23, 33,   would it show 10 and 12 as the mode?
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ucla11Author Commented:
Also how would I apply these functions to the listbox numbers.........  Mean(lstBox1.Text) ?....Mean(lstBox1.List) ?
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bingieCommented:
You would pass the name of the listbox to the function, you can then return the value to a variable or a msgbox, etc.

MsgBox Mean(List1) 'Change List1 to the name of your list box
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Mikal613Commented:
Private sub MyMsgBox(Lst as listbox)
  msgbox mean(lst.list)

end sub
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ucla11Author Commented:
I tryed your code but the mean does not show anything in the textbox as a result, the meian works fine. Does anyone have an idea how to do the mode function?

Here is what I have now.....
Text2.Text is for the Mediam'  Text3.Text is for Mean, and Text4.Text is for the Mode(do not have code yet!)

Private Function median(lstbox As Control)
Dim sum As Long

If lstbox.ListCount Mod 2 = 1 Then
    lstbox.ListIndex = (lstbox.ListCount / 2) - 0.5
    median = lstbox.Text
Else
    x = (lstbox.ListCount / 2)
    sum = Val(lstbox.List(x - 1)) + Val(lstbox.List(x))
    median = sum / 2
End If
End Function

Private Function mean(lstbox As Control)
Dim sum As Long
Dim average As Long
Dim i As Integer
For i = 0 To lstbox.ListCount - 1
 lstbox.ListIndex = i
 sum = sum + Val(lstbox.Text)
Next
 average = sum / i
End Function

Private Sub Command1_Click()
lstbox.AddItem (CLng(Text1.Text))
Text1.Text = ""
Text1.SetFocus
End Sub

Private Sub Command2_Click()
Text2.Text = median(lstbox)
Text3.Text = mean(lstbox)
End Sub

Private Sub Command4_Click()
End
End Sub
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bingieCommented:
Aww shoot - I have to stop posting at 2:00 am :)

Change the line:

average = sum / i
  to
mean = sum / i
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ucla11Author Commented:
I still a a way to figure out the Mode......anybody?
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bingieCommented:
Check out this code, contains functions for most statistical applications.

http://www.planetsourcecode.com/vb/scripts/ShowCode.asp?txtCodeId=21647&lngWId=1
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