The Excel file `ferre_et_al_emojis_database.xlsx` includes the following columns:
- `id` Number that identifies the emoji in the database
- `ascii_code` ASCII code of the emoji
- `emoji` Image of the emoji
- `category_general` Category of the emoji (general)
- `category_specific` Category of the emoji (specific)
- `face` Indicates whether the emoji represents a face (1) or not (0)
- `definition` Definition of the emoji (used for clarity ratings)
- `ambiguous` Indicates whether the emoji has more than one meaning (1) or not (0)
- `freq` Mean frequency of use
- `freq_sd` SD frequency of use
- `freq_n` Number of ratings used to calculate mean frequency of use
- `freq_dkn` Number of "I don't know this emoji" responses in the frequency of use questionnaire
- `fam` Mean familiarity
- `fam_sd` SD familiarity
- `fam_n` Number of ratings used to calculate mean familiarity
- `fam_dkn` Number of "I don't know this emoji" responses in the familiarity questionnaire
- `vcomp` Mean visual complexity
- `vcomp_sd` SD visual complexity
- `vcomp_n` Number of ratings used to calculate visual complexity
- `vcomp_dkn` Number of "I don't know this emoji" responses in the visual complexity questionnaire
- `clar` Mean clarity
- `clar_sd` SD clarity
- `clar_n` Number of ratings used to calculate mean clarity
- `clar_dkn` Number of "I don't know this emoji" responses in the clarity questionnaire
- `aro` Mean emotional arousal
- `aro_sd` SD emotional arousal
- `aro_n` Number of ratings used to calculate mean emotional arousal
- `aro_dkn` Number of "I don't know this emoji" responses in the arousal questionnaire
- `val` Mean emotional valence
- `val_sd` SD emotional valence
- `val_n` Number of ratings used to calculate mean emotional valence
- `val_dkn` Number of "I don't know this emoji" responses in the valence questionnaire