Solved

Mean, Mode , Median fuctions

Posted on 2004-10-11
11
1,452 Views
Last Modified: 2013-12-26
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.........
0
Comment
Question by:ucla11
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 4
  • 2
11 Comments
 
LVL 11

Expert Comment

by:bingie
ID: 12283109
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)
0
 
LVL 11

Accepted Solution

by:
bingie earned 500 total points
ID: 12283231
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
0
SharePoint Admin?

Enable Your Employees To Focus On The Core With Intuitive Onscreen Guidance That is With You At The Moment of Need.

 

Author Comment

by:ucla11
ID: 12285094
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?
0
 

Author Comment

by:ucla11
ID: 12285108
Also how would I apply these functions to the listbox numbers.........  Mean(lstBox1.Text) ?....Mean(lstBox1.List) ?
0
 
LVL 11

Expert Comment

by:bingie
ID: 12286232
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
0
 
LVL 48

Expert Comment

by:Mikal613
ID: 12286262
Private sub MyMsgBox(Lst as listbox)
  msgbox mean(lst.list)

end sub
0
 

Author Comment

by:ucla11
ID: 12289604
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
0
 
LVL 11

Expert Comment

by:bingie
ID: 12290447
Aww shoot - I have to stop posting at 2:00 am :)

Change the line:

average = sum / i
  to
mean = sum / i
0
 

Author Comment

by:ucla11
ID: 12292980
I still a a way to figure out the Mode......anybody?
0
 
LVL 11

Expert Comment

by:bingie
ID: 12302883
Check out this code, contains functions for most statistical applications.

http://www.planetsourcecode.com/vb/scripts/ShowCode.asp?txtCodeId=21647&lngWId=1
0

Featured Post

Enroll in July's Course of the Month

July's Course of the Month is now available! Enroll to learn HTML5 and prepare for certification. It's free for Premium Members, Team Accounts, and Qualified Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction In a recent article (http://www.experts-exchange.com/A_7811-A-Better-Concatenate-Function.html) for the Excel community, I showed an improved version of the Excel Concatenate() function.  While writing that article I realized that no o…
This article describes some techniques which will make your VBA or Visual Basic Classic code easier to understand and maintain, whether by you, your replacement, or another Experts-Exchange expert.
As developers, we are not limited to the functions provided by the VBA language. In addition, we can call the functions that are part of the Windows operating system. These functions are part of the Windows API (Application Programming Interface). U…
Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…
Suggested Courses
Course of the Month9 days, 3 hours left to enroll

615 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question