單項與雙項回答方式的分別：一些實徵證據

Differences Between Odd and Even Number of Response Scale: Some Empirical Evidence

港台的研究人員會發現在香港的中國人較不願對敏感的政治問題表達意見，再加上中國人一般較為含蓄，因此推論在設計問卷時，單項的回答方式（即含有一不表示意見的中間點者）會導致資料的偏差，影響研究結果。本研究採用不同的心理測量項目，包括在西方發展的、專針對中國文化發展的、及為一特定研究問題而設定的項目，以香港的兩個樣本（895名大學生及1687名正在工作的僱員），測試以上的偏差，結果顯示單項回答方式並未使資料的變異減少，雖然它可能使平均得分增加，但對研究結果的影響不會很大。

Some researchers argued that reluctance among Chinese people in expressing opinions might affect the validity of data collected using odd number response scale of structured questionnaires. This study tested this speculation by a variety of measures in two samples: 895 full time undergraduate students, 1687 alumni who were employed for full time jobs. Results did not support the speculation that the variances of the data would be smaller for the odd number response scale. Although the mean scores gathered may he higher for those from the odd than the even number scale, its effects on research findings would be minimal.