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Table 2 Notable word clusters representing informal latent topics extracted from posts to r/SuicideWatch

From: Automatic extraction of informal topics from online suicidal ideation

Risk factor

Cluster 1

Cluster 2

Cluster 3

Cluster 4

Cluster 5

Bullying (8)

hit (5372)

against (3612)

mad (2645)

physically (3458)

started (21893)*

 

turned (5016)

abuse (2218)

threatened (1054)

emotionally (2451)

high school (8846)

 

broke (4541)

involved (1606)

fights (740)

bullied (2375)

hated (3034)*

 

throw (2145)

behavior (923)

yelling (560)*

treated (2183)

dropped out (1830)*

 

beat (2132)*

rape (767)*

bully (455)*

raped (1625)*

bullying (1005)*

Depressive feelings (10)

very (33446)

feel (125439)

no (109179)

happiness (5251)

into (32556)

 

depressed (20645)

am (114263)

any (50721)

sense (5040)

fall (22057)

 

become (9027)

feeling (26390)

real (12766)

sort (4433)

down (3249)

 

angry (5752)

alone (25203)

future (10001)

lack (3606)

slowly (3151)

 

extremely (4807)

sad (10933)

experience (5321)

desire (2629)

deep (2733)

Depressive symptoms (9)

these (16523)

day (36329)

room (8007)

pain (21604)

chest (2843)

 

thoughts (13084)

days (14379)

crying (7023)

fear (6492)

stomach (1543)

 

feelings (7829)

sleep (13630)

cried (2405)

constant (3805)

heavy (1047)

 

suicidal thoughts (5999)

hours (10181)

tears (2356)*

sadness (2810)

panic attack (989)

 

emotions (3258)

cry (7077)

screaming (1551)*

guilt (2749)

panic (983)

Drug Abuse (3)

pills (6482)

medication (5829)

drugs (5581)

  
 

bottle (2204)

meds (4811)

drunk (4560)

  
 

overdose (1451)

medicine (1537)

drinking (3660)

  
 

sleeping pills (1036)

antidepressants (1432)

alcohol (3006)

  
 

xanax (729)*

mg (1211)

weed (1423)*

  

Family violence and discord (1)

father (9207)

    
 

kids (6564)

    
 

child (5125)

    
 

abusive (2063)

    
 

divorce (1508)*

    

Gun ownership (0)

     

Impulsivity (0)

     

Prior suicide attempt (3)

since (32577)

hospital (8014)

   
 

past (17510)

admitted (1339)

   
 

suicidal (15001)

er (1121)

   
 

times (10523)*

hospitalized (1049)*

   
 

attempt (4238)*

committed (792)*

   

Psychological disorders (6)

depression (26860)

therapist (6517)

problems (12848)

tried (30016)

results (836)

 

anxiety (10311)

doctor (5205)

due (7429)

therapy (6619)

combination (513)

 

diagnosed (3905)

psychiatrist (3084)

issues (5561)

doctors (2947)

ect (461)

 

bipolar (1964)

treatment (1861)

stress (4894)

several (2791)

levels (455)

 

social anxiety (1810)

mental health (1680)

emotional (2733)

medications (1264)

hormones (422)

Self-harm (2)

cut (7379)

body (7210)

   
 

cutting (3095)

heart (5707)

   
 

knife (2143)

blood (1618)*

   
 

wrists (1392)

burn (697)*

   
 

scars (1016)*

tear (562)*

   

Suicide around individual (1)

family (41145)

    
 

parents (30890)

    
 

kill herself (1327)*

    
 

kill himself (1064)*

    
 

committed suicide (971)*

    

Suicide ideation (8)

thought (30326)

hanging (3298)

head (13150)

edge (2508)

plan (6527)

 

suicide (25416)

hang (2736)

gun (4240)

near (2191)

easy (5018)

 

thinking (20582)

rope (1836)

hand (3929)

jump (2177)

option (2907)

 

mind (15745)

neck (1598)

pull (2406)

bridge (1764)

method (1576)

 

killing myself (8223)

noose (811)

trigger (1577)

building (1684)

quick (1559)

Other important (23)

stupid (11266)

money (18076)

died (5854)

nice (7526)

girl (15934)

 

such (11259)

pay (6742)

cancer (1974)

perfect (3430)

relationship (11081)

 

man (6788)

debt (3360)

killed (1449)

beautiful (3388)

guy (10570)

 

failure (6169)

cant afford (2526)

disease (995)

strong (3303)*

loved (8486)*

 

selfish (5821)

rent (2136)

brain damage (216)*

smart (2577)*

broke up (4120)*

Accessory (26)

eat (4649)

internet (3720)

bought (1799)

years (41839)

phone (4797)

 

food (3724)

music (3034)

clothes (1348)

year (22996)

online (4081)

 

buy (2794)

watch (2706)

bag (687)

two (17720)

text (3848)

 

water (1440)

computer (2481)

table (683)

months (13798)

contact (3480)

 

pack (522)*

game (2426)

laptop (646)

week (13076)

message (2318)

  1. Clusters are manually labeled according to risk factors proposed by experts. Gun Ownership and Impulsivity intentionally left blank, as none of the discovered clusters matched those risk factors. Additionally, other clusters were identified that held relevant semantic meaning, but didn’t fit into the risk factors. These were included under the label Accessory. Number next to risk factor indicates number of clusters with its label. Number next to word indicates frequency of occurrence in corpus. “*” incdicates that term is not among the top 5 common terms of cluster