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Asset: Key Factor
Buy when the coloured
lines trend higher, sell when
they trend lower
This tool is intended to
show the influence on share prices of the key economic factor. For each asset class an
appropriate economic time series has been chosen that best explains performance. The most
suitable time series will also vary depending on the investment perspective under
analysis.
This tool is designed not
only to show the historic relationship but also to provide a best guess as to the future
trend. PIT has developed an econometric model to forecast key factors from the top-down,
so as to avoid the widespread tendency for over-optimism generated by aggregating
bottom-up estimates. For comparability, total return indexes have been rebased to set
year-end 1994 at 100, and the key economic time series has been rebased to set 1995 at
100.
In each chart the stock
market index is shown as the
thick white line on the right
hand axis. The main explanatory variable, the historic economic time series, shown as the thin yellow line, uses the left hand axis as does the Best
Guess for its future development, shown as the thin orange line.
Both historic data and Best
Guesses should be treated as general indications of trend only. Even though these are the
best relationships that can be consistently applied across all markets, correlations may
be poor for some styles in some regions. In other cases correlations of past performance
may be good, but the modelling is subject to a high degree of uncertaintly in its ability
to predict future developments.
Best Guesses suggest what
would happen to future performance for each asset class based on the PIT econometric
model, tested over 15-25 years of historic data, which utilises consensus estimates for
GDP, interest rates, wages and prices.
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