Table 2.

Top 20 keywords for question 2 using TF and TF–IDF analyses

Rank	TFa		TF–IDFb
	Keywords	Frequency	Keywords	TF–IDF
1	Patient	300	Medical Practice	53
2	Physician	248	Experience	32
3	Thought	142	Attitude	31
4	Medical Practice	113	First	30
5	Skill	111	Effort	30
6	Attitude	53	Study	30
7	Experience	52	Mistake	29
8	Mistake	51	Process	28
9	First	49	Best	27
10	Process	43	Work	27
11	Study	42	Importance	24
12	Best	37	Lack	23
13	Effort	37	Person	22
14	Person	34	Knowledge	21
15	Importance	33	Mind	20
16	Work	32	Medical	19
17	Lack	32	Mr. or Ms.c	19
18	Mind	29	Diagnosis	18
19	Knowledge	27	Professor	18
20	Mr. or Ms.	26	Senior	17

^aTF Term frequency

^bTF–IDF Term frequency–inverse document frequency

^cThe original Korean word (“sensayngnim”), which can be translated into Mr. or Ms., is often used as an honorific title in combination with the words “doctor” or “nurse”