3. Expanding the Range of Comparable Firms
Searching for comparable firms within the sector in which a firm operates is fairly
restrictive, especially when there are relatively few firms in the sector or when a firm
operates in more than one sector. Since the definition of a comparable firm is not one that
is in the same business but one that has the same growth, risk and cash flow
characteristics as the firm being analyzed, we need not restrict our choice of comparable
firms to those in the same industry. A software firm should be comparable to an
automobile firm, if we can control for differences in the fundamentals.
The regression introduced in the previous section allows us to control for
differences on those variables that we believe cause multiples to vary across firms. Based
upon the variables listed in Table 12.7, we should be able to regress PE, PBV and PS
ratios against the variables that should affect them:
Price Earnings = f (Growth, Payout ratios, Risk)
Price to Book Value = f (Growth, Payout ratios, Risk, ROE)
Price to Sales = f (Growth, Payout ratios, Risk, Margin)
It is, however, possible that the proxies that we use for risk (beta), growth (expected
growth rate), and cash flow (payout) may be imperfect and that the relationship may not
be linear. To deal with these limitations, we can add more variables to the regression -
e.g., the size of the firm may operate as a good proxy for risk - and use transformations of
the variables to allow for non-linear relationships.
We ran these regressions
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for PE, PBV, and PS ratios across publicly listed firms
in the United States in January 2004 against analyst estimates of expected growth in
earnings per share and other financial indicators from the most recent year. The sample,
which had more than 7000 firms in it, yielded the regressions reported below. These
regressions can then be used to get predicted PE, PBV, and PS ratios for each firm,
which, in turn, can be compared to the actual multiples to find under and over valued
firms.
PE = 9.475 + 0.814 Expected growth + 0.06 Payout + 6.283 Beta (R2 = 22.1%)
PBV= 0.140 ROE + 0.599 Beta + 0.08 Expected Growth +.002 Payout (R2= 47.1%)