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The basic formula's below generate additional prediction tables
in the PF - Performance section of this Web Page.
The 4 prediction methods used in the PF section have many flaws.
Purdy points are really not supposed to be used for predictions just
for performance measurements.  Obviously a world class 1000 purdy pt.
100m sprinter can not expect reach that level in longer distance events.
Like wise a world class marathoner cannot achieve the same purdy points
in sprint events.  As far as true prediction formula's ...I don't really
know which system is best..... not enough people have responded and
I haven't really researched this at all.  Some one mentioned Daniel
Tables ... as being more accurate ?  .. this should correspond to the
VO2max predictions. Intuitively, it seems that the Coe Martion idea
of three types of distance runners would be a better prediction method.
Hence, I have added them to my tables.  What I do is simply use the times
for 10k, 5k, and 1.5k purdy tables and plug them into the formula's below.
The Coe-Martin tables will only be accurate when a 10k, 5k or 1.5k time
is entered and even then only one of the tables will be accurate.
The problem of "first Marathon" prediction time has enough options
but I'm now leaning toward 4.76 times your 10k performance....
based on the formulas below.

**********************************************************************
Predict times (10k-marathon)(Tim Tarmsro@metz.une.oz.au)
In `Training Distance Runners' Coe and Martin come up with three sets of
formulas for determining equivalent race performances over several
distances when the performance for one distance is known. They have three
tables to counter problems of athlete specificity.

For long distance specialists (i.e 10k/15km) : Marathon = 4.76Y : 10k = Y
: 5k = 0.48Y
: 3k = 0.28Y
: 1.5k = 0.13Y

For 3k/5k runners : 10k = 2.1Y
: 5k = Y
: 3k = 0.58Y
: 1.5k = 0.27Y
: 800m = 0.13Y
: 400m = 0.06Y

For `real' middle distance: (800 - mile?) 5k = 3.63Y
: 3k = 2.15Y
: 1.5k = Y
: 800m = 0.48Y
: 400m = 0.22Y
**********************************************************************
Conversion chart (Jack Berkery BERKERY@CRDGW2.crd.ge.com)
1yard=.9144meter
100 yards = 91.4400 meters
220 yards = 201.1680 meters
440 yards = 402.3360 meters
880 yards = 804.6720 meters
1 meter = 1.094 yards
100 meters = 109.400 yards
200 meters = 218.800 yards
400 meters = 437.600 yards
800 meters = 875.200 yards
1 mile = 1.609 Kilometers
1 mile = 1760 yards = 5280 feet
1 Kilometer = .6214 miles = 1094 yards = 3281 feet
1 mile = 1.609 km
2km=1.2418miles 2miles=3.218km
3km=1.8642miles 3miles=4.827km
4km=2.4856miles 4miles=6.436km
5km=3.1070miles 5miles=8.045km
6km=3.7284miles 6miles=9.654km
7km=4.3498miles 7miles=11.263km
8km=4.9712miles 8miles=12.872km
9km=5.5926miles 9miles=14.481km
10 km = 6.2140 miles 10 miles = 16.090 km
11 km = 6.8354 miles 11 miles = 17.699 km
12 km = 7.4568 miles 12 miles = 19.308 km
13 km = 8.0782 miles 13 miles = 20.917 km
14 km = 8.6996 miles 14 miles = 22.526 km
15 km = 9.3210 miles 15 miles = 24.135 km
20 km = 12.4280 miles 20 miles = 32.180 km
25 km = 15.5350 miles 25 miles = 40.225 km
30 km = 18.6420 miles
1 marathon = 26 miles + 385 yards = 42.186 km
```