| center_cols | A simple function to mean center variables |
| day_max | Calculates the max of variables at the day level |
| day_max_relsd | Calculates the (person level) relative standard deviation of... |
| day_max_sd | Calculates the (person level) standard deviation of daily... |
| day_mean | Calculates the mean of variables at the day level |
| day_mean_relsd | Calculates the (person level) relative standard deviation of... |
| day_mean_sd | Calculates the (person level) standard deviation of daily... |
| day_min | Calculates the min of variables at the day level |
| day_min_relsd | Calculates the (person level) relative standard deviation of... |
| day_min_sd | Calculates the (person level) standard deviation of daily... |
| day_relsd | Calculates the relative sd of variables at the day level |
| day_sd | Calculates the sd of variables at the day level |
| emacalc-package | emacalc: A package for performing useful calculations in... |
| esm_day_lag | Lag day-level (or wave-level, month-level, week-level)... |
| esm_lag | Lag observation-level variables |
| keep_bottom | Keeps only variables that -do- vary within the grouping... |
| keep_top | Keeps only variables that do not vary below the level of the... |
| my_rescale | A utility function that makes rescale_cols work. Usually not... |
| operate_cols | Flexibly operate on sets of variables within a dataframe |
| person_max | Calculates the max of variables at the person level |
| person_mean | Calculates the mean of variables at the person level |
| person_min | Calculates the min of variables at the person level |
| person_relsd | Calculates the relative standard deviation of variables at... |
| person_sd | Calculates the standard deviation of variables at the person... |
| rename_cols | Rename a series of columns in a dataframe |
| rescale_cols | A simple (but very useful) function to rescale variables... |
| reverse_cols | Reverse a series of columns in a dataframe |
| trim_min_obs | Keep only groups (usually days) with enough observations. |
| trim_min_valid_obs | Keep only groups (usually days) with enough non-missing... |
