This is the 3656th most frequent Japanese word.
df
The sequence "df" does not correspond to any specific Japanese word.
The word 'df' refers to 'data frame', a structure for organizing data in programming.
彼の研究では、データフレーム (df) を使用しました。
In his research, he used a data frame (df).
Here, 'df' again refers to 'data frame', indicating its role as a variable or component.
そのコンピュータープログラムでは df がエラーを引き起こした。
In that computer program, df caused an error.
In this case, 'df' is discussed as a subject or topic in an instructional setting.