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Log
Scales |
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ROW/COL |
B |
C |
D |
E |
F |
G |
H |
I |
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4 |
Frequently data is hard
to understand without using logs |
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Here
is some Forecasted data for the next few years. Look at the graphs below |
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8 |
Year |
Forecast |
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Alternative way to express the # |
=LOG(C9) |
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9 |
2000 |
10 |
1 |
10 ^1 |
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10 |
2001 |
100 |
2 |
10 ^2 |
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11 |
2002 |
1,000 |
3 |
10 ^3 |
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12 |
2003 |
10,000 |
4 |
10 ^4 |
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13 |
2004 |
100,000 |
5 |
10 ^5 |
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14 |
2005 |
1,000,000 |
6 |
10 ^6 |
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15 |
2006 |
10,000,000 |
7 |
10 ^7 |
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16 |
2007 |
100,000,000 |
8 |
10 ^8 |
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17 |
2008 |
1,000,000,000 |
9 |
10 ^9 |
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18 |
2009 |
10,000,000,000 |
10 |
10 ^10 |
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19 |
2010 |
100,000,000,000 |
11 |
10 ^11 |
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20 |
2011 |
1,000,000,000,000 |
12 |
10 ^12 |
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22 |
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23 |
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24 |
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Here is one picture of
the data |
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Notice that it is hard to
see what is going on. |
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Here is a picture using
the log scale |
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Notice that you can see
the series is going straight up. |
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57 |
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60 |
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61 |
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82 |
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83 |
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84 |
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85 |
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86 |
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Using the logs of the
data rather than a log axis |
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You see the same effects |
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90 |
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92 |
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105 |
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106 |
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107 |
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108 |
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111 |
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112 |
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114 |
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115 |
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