```Date: Sun, 11 Jul 2010 13:32:29 -0700 Reply-To: Arthur Tabachneck Sender: "SAS(r) Discussion" From: Arthur Tabachneck Subject: Re: Need to find a value that can make the equation's value = 0 like Solver in Excel Content-Type: text/plain; charset=ISO-8859-1 If you only need to solve for one value, couldn't you just a binary- tree-type-search using a do while loop? Art ---------- On Jul 11, 1:34 pm, CC wrote: > On Jul 10, 8:04 pm, Patrick wrote: > > > "...need to find Ri for each firm/year." > > If it's firm/year why then isn't it Ri,t? > > It would be helpful for someone like me if you also could explain what > > the different literals mean (M, B, ROE,...). I assume ROE is Return on > > Investment, but what's the rest? > > Was this formula given to you or did you develop it based on a > > problem? My unqualified impression is that this is more a question of > > getting the maths right first. > > Hi Patrick, > > The formula is a simplified version but I am sure this will not affect > the result as my main problem is to find a function to deal with it (I > am pretty sure even it is a simplified version, we can still get an > answer if we know which function we can use.). And, of course, I will > use the complete version of formula to solve this question later. The > M and B are the market value and book value, respectively. I did not > want to mention it since I will not like to confuse people and want to > simply focus on the question itself. And, yes, it should be Ri,t > instead of Ri. So, your observation is correct. Thanks for that. > But, if we can find one Ri then the rest is easy > relatively. Could you give me some suggestions on how to solve it? > Thanks. ```

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