自古以來，月亮的週期就和人類的行為息息相關。在台灣這塊慣於使用農曆的土地上，月亮週期更存在一定的影響。雖然目前科學尚無法證實月亮對人類的直接影響，但已有不少理論以間接的方式來說明月亮效應的發生。在行為財務學逐漸發展下，月亮和人類行為的關係逐漸引申至月亮週期和股價報酬之間的關係。本研究試圖以傳統理性財務資產訂價模型-公司特徵因子模型，以控制傳統代表理性決策的財務變數，並同時控制週一、週末及月份等時間因素，以求較少的時間干擾。採用縱橫資料方法(Panel Data Methods)以考慮最多的樣本，藉以檢驗台灣證券交易所上市公司之股價報酬，討論月亮效應所造就之非理性行為決策在台灣的影響。
　　本研究使用由台灣經濟新報資料庫(TEJ)所取得之股價日報酬資料。實證發現，滿月與新月在台灣的證券市場的確存在影響，且於所討論之民國84年1月1日至民國96年12月31日區間內，越接近滿月日則負面報酬影響越強，但新月區間影響相對較弱，且轉為正向報酬影響的速度也較快；另外發現滿月效應與產業的差異而有不同的表現，顯示產業間存有其他變數干擾月亮效應之影響；就台灣市場而言，月亮效應對於大市值公司的影響較顯著。本研究雖無法證實月亮對股價報酬的直接影響，但在統計上提供月亮週期影響股價報酬的證明，於此基礎之下，試圖推論在台灣股價報酬的月亮效應可能是由哪些間接因素所造成。

Since ancient times, the lunar cycles have been closely related to human behavior. In Taiwan, because Taiwanese are accustomed to use the lunar calendar, so there is a certain impact on people in Taiwan with the lunar cycles. The modern science is still unable to confirm how the moon impact on human, although there are many indirect ways illustrate that the effect of the lunar effect really occurred.
Accompanied with the development of Behavioral Finance, the relationship between the moon and the human behavior are gradually extended to discuss about the lunar cycles and the stock return. This study attempted to use traditional financial assets pricing model, which control the company characteristics variables introduced by Fama and French (1992). And this study controlled some time variables (Monday, Weekend and Month) to avoid misinterpreting the effect of lunar cycle.
In order to include more information of samples, this study use panel data methods. By discussing Taiwan listed companies’ stock return, this study tests the relationship between the lunar cycles and the abnormal stock returns resulted from irrational investment decision-making.
The daily return data of this study was obtained from Taiwan Economic Journal’s (TEJ) database. This study finds that in full moon and new moon periods, there are some special effects on Taiwan security market. During January 1995 to December 2007, this study finds that when observed period is closer to full moon days the negative effects on stock returns is more significant. But the effects on returns in the new moon period are weaker than full moon period. And the effect is rapidly changed to positive return effect with the extension of new moon sample interval. Also, the moon has different effects across different industries. In the extension research of this study, lunar effects are significantly in company with large market value.
Although we are unable to comfirm the direct effects of moon on stock return, the statistics results here are available to proof the effect of lunar cycles on stock returns. Under this basis, this study try to infer what kind of indirect effects of lunar cycle in Taiwan will affect stock returns.

中文部份
﹝1﹞周行一、徐苑玲、徐新舫、莊凱如,「散戶投資人的交易偏好」, 行為財務學暨新興市場理論與實證研討會, 世新大學,民97.01.
﹝2﹞周賓凰、池祥宣、周冠男、龔怡霖, 「行為財務學：文獻回顧與展望」, 證券市場交易季刊, 第2卷, 頁1-47, 2002.
﹝3﹞周賓凰、張宇志、林美珍, 「投資人情緒與股價報酬互動關係」, 證券市場發展季刊, 第74期, 第153-190頁, 2007.
﹝4﹞楊慧伶等編著, 行為財務學, 初版, 五南圖書, 台北市, 民國九十六年。
﹝5﹞劉淑鶯、曾昭玲, 「新月與滿月效應對股價報酬率之影響」, 第一屆全國行為財務學理論與實證研討會論文集, 世新大學, 台灣, 2002.
英文部分
﹝1﹞ Baltagi, B. H., “Econometric Analysis of Panel Data”, John Wiley & Sons, Ltd, USA, 2001.
﹝2﹞ Bouman, S. and Jacobsen B., “The Halloween Indicator, ‘Sell in May and Go Away ”, American Economic Review, vol. 92(5), pp. 1618-1635, December 2002.
﹝3﹞ Campbell, D. E. and Beets J. L., “Lunacy and the moon.”, Psychological Bulletin, vol.85, pp.1123-1129, 1978.
﹝4﹞ Crack, T. F., “A Classic Case of “Data Snooping” for Classroom Discussion”, Journal of Financial Education, Vol. 25, pp. 92-97, Fall 1999.
﹝5﹞ De Bondt, W. F. M. and Thaler R. H., “Does the Stock Market Overreact?”,
Journal of Finance, vol.40,793-805, July 1985.
﹝6﹞ Delgado, et al., ” MOON CYCLE EFFECTS ON HUMANS: MYTH OR REALITY?”, Salud Mental, diciembre, vol. 23, pp.33-39, 2000.
﹝7﹞ Dichev, I. D. and Janes T.D., “Lunar cycle effects ins tock returns”, Working Paper, August 2001.
﹝8﹞ Fama, E. F., “Efficient capital markets: A review of theory and empirical work”, Journal of finance, vol.25,pp.383-417 ,May 1970.
﹝9﹞Fama, E. F. and French, K. R., “The Cross-Section of Excepted Stock Return”, Journal of Finance, vol. 47(2), pp.427-465, June 1992.
﹝10﹞Fama, E. F., “Market Efficiency, Long-term Returns, and Behavioral Finance”, Journal of Financial Economics, vol. 49(3), pp. 283-306, September 1998.
﹝11﹞Hirshleifer, D., “Investor Psychology and Asset Pricing”, Journal of Finance, vol. 56(4), pp. 1533-1597, August 2001.
﹝12﹞Hirshleifer D. and Shumway T., “Good Day Sunshine: Stock Returns and the Weather”, Journal of Finance, vol. 58(3), pp.1009-1032, June 2003.
﹝13﹞Hong, H. and Stein, J.C., “A Unified Theory of Underreaction, Momentum Trading, and Overreaction in Asset Markets”, Journal of Finance, vol.54, pp. 2143-2184, December 1999.
﹝14﹞Hsiao, C. “Analysis of Panel Data”, New York, USA,1986.
﹝15﹞Jacobsen, B. and Marquering, W., “Is it the Weather?”, SSRN Working Paper, July 2007.
﹝16﹞Kahneman, D. and Tversky, A., “Prospect Theory：An Analysis of Decision under Risk”, Econometrica, vol. 49(2), pp. 263-291, March 1979.
﹝17﹞Kelly, I. W., Rotton, J. and Culver, R., “The moon was full and nothing happened”, Skeptical Inquirer, vol.10(2), pp. 129-143, Winter: 1986.
﹝18﹞Krivelyova, A. and Robotti, C., “Playing the Field: Geomagnetic Storms and the Stock Market”, SSRN Working Paper, October 2003.
﹝19﹞Lemon, J. S., “Psychic Effects of the Weather” , American Journal of Psychology, vol. 6, pp. 277-279, January 1894.
﹝20﹞Martin, V.,et al., “Sunshine and Suicide Incidence”, Epidemiology, vol. 13, pp. 492-494, July 2002.
﹝21﹞McAVITY, Ian, Full Moon & The Market, Deliberations: The Ian McAvity Market Letter, A Special Report, 1 May 1982.
﹝22﹞Richard, H. Thaler, “The January Effect”, Journal of Economic Perspectives, vol.1, pp. 197-201, Summer 1987.
﹝23﹞Rotton, J. and Kelly, I. W., “Lunar Cycles and the Stock Market: Time-Series Analysis for Environmental Psychologists”, Unpublished manuscript, Florida International University, 1948.
﹝24﹞Rotton, J. and Kelly, I. W., “A scale for assessing belief in lunar effects: reliability and concurrent validity”, Psychological Reports, vol. 57, pp.239-245, 1985a.
﹝25﹞Rotton, J. and Kelly I. W., “Much ado about the full moon: a meta-analysis of lunar-lunacy research.”, Psychological Bulletin, vol.97, pp. 286-306, 1985b.
﹝26﹞Saunders, Edward M, “Stock Prices and Wall Street Weather”, American Economic Review, Vol. 83, pp. 1337-1345, December 1993.
﹝27﹞Shleifer, A. and Summers, L. H., “The Noise Trader Approach to Finance”, The Noise Trader Approach to Finance, vol. 4(2), pp. 19-33, Spring 1999.
﹝28﹞Summers, L. H., “Does the Stock Market Rationally Reflect the Fundamental Values”, Journal of Finance, vol. 41(3), pp. 591-601, July 1986.
﹝29﹞Townley, J. “Dynamic Astrology: Using Planetary Cycles to Make Personal and Career Choices”, Inner Traditions International, Limited, USA, October 1996.
﹝30﹞Yuan, K., Zheng, L., and Zhu, Q., ”Are investors moonstruck? Lunar phase and stock return.”, Journal of Empirical Finance, vol. 13, pp.1-23, January 2006.