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How to Create Finance Function

  1. #1
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    How to Create Finance Function

    Hey everyone I am new to programing in Excel and I do not know enough to wright a function that finds variance of a portfolio. This is what i have so far its messy and does not work.

    Function VARPORT(Sa,Wa,Sb,Wb,Sc,Wc,Sd,Wd,Se,We)

    va=VAR(Sa)
    vb=VAR(Sb)
    vc=VAR(Sc)
    vd=VAR(Sd)
    ve=VAR(Se)


    cab=Covar(va,vb)
    cac=Covar(va,vc)
    cad=Covar(va,vd)
    cae=Covar(va,ve)
    cbc=Covar(vb,vc)
    cbd=Covar(vb,vd)
    cbe=Covar(vb,ve)
    ccd=Covar(vc,vd)
    cce=Covar(vc,ve)
    cde=Covar(vd,ve)

    VAPORT=((Wa^2)*va)+((Wb^2)*vb)+((Wc^2)*vc)+((Wd^2)*vd)+((We^2)*ve)+(2*Wa*Wb*cab)+(2*Wa*Wc*cac)+(2*Wa*Wd*cad)+(2*Wa*We*cae)+(2*Wb*Wc*cbc)+(2*Wb*Wd*cbd)+(2*Wb*We*cbe)+(2*Wc*Wd*ccd)+(2*Wc*We*cce)+(2*Wd*We*cde)
    End Function

    The S stands for a list of stock returns.
    The W is what percentage of the portfolio is spent on that stock.
    The Covar and Var functions are to calculate the variance of each stock and the covariance between the five.
    The three letters are C for covariance and then what stock will be looked at.

    This is very confusing to me and I know I just made a big mess, can anyone help or point me int he right direction.
    Last edited by Bigbam21288; 08-18-2010 at 08:09 PM.

  2. #2
    Forum Guru shg's Avatar
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    Re: I need help making a finance function.

    Welcome to the forum.

    Please take a few minutes to read the forum rules, and then amend your thread title accordingly.

    Thanks.
    Entia non sunt multiplicanda sine necessitate

  3. #3
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    Re: How to Create Finance Function

    This add-in is a possible solution:
    http://www.tvmcalcs.com/blog/comment...or_Excel_2007/

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