Making Profit in Stock Investment Before XD Dates by Using Genetic Algorithm - Innovative Management in Information and Production - page 335

Tabl e 2 Comparison of the profit from genetic algorithm and the real data (first
half of the year) with zero mutation rate
Average profit Average potential
from genetic profit from
algorithm in the real data when Performance
Stocks and out-of-sample buying at the genetic of
investment plans tests (%) lowest price (%) algorithm* (%)
ADVANC30 2.17 7.58 28.63
ADVANC40 1.43 8.11 17.63
ADVANC50 3.91 8.87 44.08
CPALL30 5.21 10.20 51.08
CPALL40 7.10 11.49 61.79
CPALL50 9.72 14.35 67.74
CPF30 5.02 10.85 46.27
CPF40 13.75 17.07 80.55
CPF50 17.02 20.35 83.64
IVL30 2.30 23.61 9.74
IVL40 25.35 30.88 82.09
IVL50 43.78 48.33 90.59
KBANK30 5.83 10.24 56.93
KBANK40 5.86 13.26 44.19
KBANK50 9.58 17.08 56.09
PTT30 2.96 7.98 37.09
PTT40 3.08 9.90 31.11
PTT50 3.09 11.64 26.55
SCC30 7.27 11.67 62.30
SCC40 7.60 13.08 58.10
SCC50 7.72 12.79 60.36
TCAP30 14.48 16.44 88.08
TCAP40 18.78 23.25 80.77
TCAP50 18.72 25.00 74.88
Average of all stocks 10.07 16.00 62.94
Note: Exchange rate THB30.8358/USD1.00, Bank of Thailand, October 2011
Source: The Stock Exchange of Thailand, October 2011

5.2 Comparison Between XD Dates in the First and Second

Half of the Year

XD dates in the first half of the year are superior to the second half by at least two
reasons. First, almost all companies pay dividend in the first half of the year even
though many of them also pay in the second half too. This attracts more investors
to speculate the stock prices in this period more than in the second half. Second,
the announcement of dividend payment and XD dates is made longer than in the
second half. In the first half, the announcement is around 40-50 days before XD
dates compared to 10-15 days in the second half. This longer period makes investors