由於這些研究僅涉及與研究人群的一次接觸，因此相對而言便宜進行並且易於分

由於這些研究僅涉及與研究人群的一次接觸，因此相對而言便宜進行並且易於分析。但是，它們的最大缺點是它們無法衡量變化。要測量變化，必須至少有兩個數據收集點–即至少兩個橫截面在兩個時間點上針對同一人群進行研究。

結果 (英文) 1:

Because these studies involve only once in contact with the study population, and therefore relatively inexpensive and easy to perform analysis.
However, their biggest drawback is that they can not measure change.
To measure changes, must have at least two data collection point - i.e., two for the same cross-sectional study population in at least two points in time.

結果 (英文) 2:

It is said that the classic guitar play is not different with the Yom of the Khetta.

結果 (英文) 3:

Because these studies involve only one contact with the study population, they are relatively inexpensive and easy to analyze.
But their biggest disadvantage is that they can't measure change.
To measure change, there must be at least two data collection points - at least two cross-sections that study the same population at two time points.