How to convert all characters of a data frame to Numeric



```
char_columns<-sapply(merged_data, is.character) #identify character columns
data_char_num<-merged_data #replicate data
data_char_num[,char_columns]<-as.data.frame(apply(data_char_num[,char_columns],2, as.numeric))#recode character as numeric
sapply(data_char_num, class) #print classes of all columns
```

Introduction to the Analysis of Survival Data in the Presence of Competing Risks

 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4741409/

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