Bank Cost Data, 500 Banks, 5 Years:   

Variables in the file are

Cit   = total cost of transformation of financial and physical resources into loans and investments 
      = the sum of the five cost items described below;

Y1it  = installment loans to individuals for personal and household expenses;
Y2it  = real estate loans;
Y3it  = business loans;
Y4it  = federal funds sold and securities purchased under agreements to resell;
Y5it  = other assets;

W1it  = price of labor, average wage per employee;
W2it  = price of capital = expenses on premises and fixed assets divided by the dollar value of
        of premises and fixed assets;
W3it  = price of purchased funds = interest expense on money market deposits plus expense of
        federal funds purchased and securities sold under agreements to repurchase plus interest
        expense on demand notes issued by the U.S. Treasury divided by the dollar value of purchased funds;
W4it  = price of interest-bearing deposits in total transaction accounts = interest expense on
        interest-bearing categories of total transaction accounts;
W5it  = price of interest-bearing deposits in total nontransaction accounts = interest expense on
        total deposits minus interest expense on money market deposit accounts divided by the
        dollar value of interest-bearing deposits in total nontransaction accounts;
T     = trend variable, t = 1,2,3,4,5 for years 1996, 1997, 1998, 1999, 2000

The data in the file are for a translog cost function, linearly homogeneous in the input prices.  Specifically,

C = log(Cost/W5); W1, W2, W3, W4 = log(Wj/W5), Q1, ..., Q5 = log(Ym), 
and the squared and cross product terms are W11, W12,..., Q11, Q12,..., W1Q1,...,W4Q5, T, T2, TW1,...,TW4, TQ1,...,TQ5.