# GTAPViz: Utilities

#### Pattawee Puangchit

#### 2025-04-17

This vignette provides other useful functions in the `GTAPViz` package.

# 1 Adding Unit and Description Columns

If you manually import data or need to adjust the `"Description"` and `"Unit"` columns, you can use the following command:

    # Create mapping file
    mapping_df <- data.frame(
      Variable = c("qgdp", "EV", "ppriv"),
      Description = c("Real GDP Index", "Welfare Equivalents", "Consumer Price Index"),
      Unit = c("Percent", "million USD", "percent"),
      stringsAsFactors = FALSE
    )

    datasets <- add_mapping_info(mapping_df,
                                 external_map = mapping_df,
                                 mapping = "Yes")

# 2 Convert Different Units

You can convert all units across all data frames within the data list by using the following code:

    your_data <- sl4.plot.data   # Change this to your data list name

    your_data <- convert_units(change_unit_from = c("BAHT", "million USD"),
                               change_unit_to = c("USD", "billion USD"),
                               adjustment = c("*34.5", "/1000"))

Explanation

What does this code do?

- Converts `BAHT` to `USD` by multiplying the values by 34.5.

- Converts `million USD` to `billion USD` by dividing the values by 1,000.

Parameters:

- `change_unit_from`: The original unit name to be changed in the `"Unit"` column.
  If your dataset does not yet include a `"Unit"` column, please refer to adding unit and description columns.

- `change_unit_to`: The new unit name to be recorded in the `"Unit"` column.

- `adjustment`: The mathematical operation used to transform the values.
  Accepts operators such as `/`, `*`, `+`, or `-`.

# 3 Renaming Columns and Data List Names

To modify column names across all datasets and/or rename data list names automatically—such as changing `REG` to `Region` or `COMM` to `Commodity`—use the following command:

    # Creating Mapping File
    rename_col <- data.frame(
      old = c("REG", "COMM", "ACTS"),
      new = c("Region", "Commodity", "Activity")
      )

    har.plot.data <- HARplus::rename_dims(har.plot.data,
                                          mapping_df = rename_col,
                                          rename_list_names = FALSE)

💡 Tip

You can create this mapping dataframe in Excel and import it into R. The column names must be “old” and “new”.

# 4 Sorting Output

This function allows you to sort data before generating plots or tables.
For example, you can display `EXP2` before `EXP1`, or `SEAsia` before `Oceania`.

It supports:

- Sorting by multiple columns simultaneously for precise output control

- Applying consistent sorting across all data frames within a data list

See `?sort_plot_data` for full details.

Key arguments:

- `cols` specifies the column(s) to sort based on a predefined order (e.g., in `sl4.plot.data`, `Experiment` and `Region` will follow the defined order).

- `sort_by_value_desc` controls whether sorting is in descending order (`TRUE/FALSE/NULL`).

To apply sorting, use the following command:

    # Using the function
    sort_sl4_plot <- sort_plot_data(
      sl4.plot.data,
      sort_columns = list(
        Experiment = c("EXP2", "EXP1"), # Column Name = Sorting Order
        Region = c("SEAsia", "Oceania")
        ),
      sort_by_value_desc = NULL
    )

# 5 Renaming Values

To automatically modify values in any column before plotting—such as renaming country names in the `REG` column (e.g., changing `"USA"` to `"United States"` or `"CHN"` to `"China"`)—use the following command:

    # Creating Mapping File
    rename.region <- data.frame(
      ColumnName = "REG",
      OldName = c("USA", "CHN"),
      NewName = c("United States", "China"),
      stringsAsFactors = FALSE
    )

    sl4.plot.data_rename <- rename_value(sl4.plot.data, mapping.file = rename.region)

Another useful example is renaming the components of welfare decomposition before plotting.

    # Rename Value if needed
    wefare.decomp.rename <- data.frame(
      ColumnName = "COLUMN",
      OldName = c("alloc_A1", "ENDWB1", "tech_C1", "pop_D1", "pref_G1", "tot_E1", "IS_F1"),
      NewName = c("Alloc Eff.", "Endwb", "Tech Chg.", "Pop", "Perf", "ToT", "I-S"),
      stringsAsFactors = FALSE
    )

    welfare_decomp <- rename_value(har.plot.data, mapping.file = wefare.decomp.rename)

# 6 (HARplus) Manual Data Processing

This section is for non-GTAP models or manual data extraction for plotting. Follow these steps:

1. Use `"HARplus::load_sl4x"` or `"HARplus::load_harx"`, then `"HARplus::group_data_by_dims"` to structure the data in the required format.

2. Filter each dataframe using standard R `data.frame` operations.

3. Add the “Unit” and “Description” columns using `"add_mapping_info"` (the “Unit” column is required for plotting).

    # Step 1: Filtering Data using Dataframe and lapply
    manual.data <- lapply(sl4data, function(x) {
      if (is.data.frame(x)) {
        x[x$REG %in% selected_regions & x$COMM %in% selected_sector & x$ACTS %in% selected_sector
          & x$Experiment %in% selected_exp , ]
      } else {
        x
      }
    })

    # Step 2: Adding Unit and Description Column
    manual.data <- add_mapping_info(manual.data, external_map = "/your/mapping.xlsx",
                                    description_info = TRUE,
                                    unit_info = TRUE)

# 7 Sample Data

Sample data used in this vignette is obtained from the GTAPv7 model and utilizes data from the GTAP 11 database. For more details, refer to the GTAP Database Archive.