7 Ways to use EviewsR

The package can work with base R, R Markdown or Quarto document.

7.1 EviewsR along with R Markdown or Quarto document

After loading the package, a chunk for Eviews can be created by supplying eviews as the engine name in R Markdown or Quarto document as shown below :

```eviews
    'This program is created in R Markdown with the help of EviewsR package
  
  wfcreate(page=EviewsRPage,wf=EviewsR_workfile) m 2000 2022
  for %y EviewsR package page1 page2
  pagecreate(page={%y}) EviewsR m 2000 2022
  next
  pageselect EviewsRPage
  rndseed 123456
  genr y=@cumsum(nrnd)
  genr x=@cumsum(nrnd)
  equation ols.ls y c x
  freeze(OLSTable,mode=overwrite) ols
  freeze(EviewsR_Plot,mode=overwrite) y.line
  wfsave EviewsR_workfile
```

Figure 7.1: EViews graphs imported automatically by fig-EviewsR chunk

The above chunk creates an Eviews program with the chunk’s content, then automatically open Eviews and run the program, which will create an Eviews workfile with pages containing monthly sample from 2000 to 2022. The program will also save an EViews workfile named EviewsR_workfile in the current directory.

The eviews chunk automatically returns the outputs of each equation object as a dataframe, accessible via chunkLabel$pageName_equationName. For example, The R² of the ols equation object is 0.044951, which can be accessed using `r EviewsR$eviewsrpage_ols$r2`. We can obtain the table object by chunkLabel$pageName_tableName. Therefore, EviewsR$eviewsrpage_olstable will give us the OLSTable object as dataframe. Note the underscore (_) between the pageName and equationName, and between the pageName and tableName.

EviewsR$eviewsrpage_ols$r2
#> [1] 0.044951
EviewsR$eviewsrpage_ols$aic
#> [1] 4.310163
K = EviewsR$eviewsrpage_olstable[c(6, 8, 9), 1:5]
colnames(K) = NULL
knitr::kable(K, row.names = F, caption = "Selected cells of  EViews table object")

Table 7.1: Selected cells of EViews table object
Variable	Coefficient	Std. Error	t-Statistic	Prob.
C	-0.301413	0.260956	-1.155033	0.2491
X	-0.051410	0.014316	-3.591137	0.0004

Table 7.1: Selected cells of EViews table object

The EViews series objects are also imported automatically as dataframe (by default) or xts objects (if we use chunk option class="xts"). They are accessed via chunkLabel$pageName.

head(EviewsR$eviewsrpage)
#>         date           x          y
#> 1 2000-01-01 -0.06062345 0.34705763
#> 2 2000-02-01  0.40287977 0.04959103
#> 3 2000-03-01  1.13387526 0.56589164
#> 4 2000-04-01  1.34089330 1.35264827
#> 5 2000-05-01  0.54596099 1.05434874
#> 6 2000-06-01  0.96869514 0.61693341

7.2 EviewsR along with base R

7.2.1 The create_object() function

The function create_object() can be used to create an Eviews object in the existing EViews workfile.

create_object(wf = "EviewsR_workfile", action = "equation", action_opt = "",
    object_name = "eviews_equation", view_or_proc = "ls", options_list = "",
    arg_list = "y ar(1)")

create_object(wf = "EviewsR_workfile", object_name = "x1", object_type = "series",
    expression = "y^2")

7.2.2 The eviews_graph() function

EViews graphs can be included in R Markdown or Quarto document by eviews_graph() function.

To create graph from existing EViews series objects:

eviews_graph(wf = "EviewsR_workfile", page = "EviewsRPage", series = "x y",
    mode = "overwrite", graph_procs = "setelem(1) lcolor(red) lwidth(4)",
    graph_options = "m")

Figure 7.2: Graphs of existing EViews series objects imported by fig-eviewsGraph chunk

We can also create graph objects from an R dataframe

Data = data.frame(x = cumsum(rnorm(100)), y = cumsum(rnorm(100)))
eviews_graph(series = Data, group = TRUE, start_date = "1990Q4",
    frequency = "Q")

Figure 7.3: Graphs of an R dataframe imported by fig-eviewsGraph1 chunk

To plot a scatter graph and histogram on the same frame:

eviews_graph(wf = "EviewsR_workfile", page = "EviewsRPage", series = "x y",
    group = T, graph_command = "scat(ab=histogram) linefit()",
    mode = "overwrite", graph_procs = "setelem(1) lcolor(green) lwidth(2)")

Figure 7.4: Scatter graph along with histogram

7.2.3 The eviews_import() function

Data can be imported from external sources by eviews_import() function.

eviews_import(source_description = "eviews_import.csv", start_date = "1990",
    frequency = "m", rename_string = "x ab", smpl_string = "1990m10 1992m10")

Alternatively, use the dataframe as the source_description.

eviews_import(source_description = Data, wf = "eviews_import1",
    start_date = "1990", frequency = "m", rename_string = "x ab",
    smpl_string = "1990m10 1992m10")

7.2.4 The eviews_pagesave() function

Similar to Eviews workfile, an Eviews page can be saved in various formats by eviews_pagesave() function.

eviews_pagesave(wf = "eviewsr_workfile", page = "EviewsRPage",
    source_description = "pagesave.csv", drop_list = "y")

7.2.5 The eviews_wfcreate() function

An Eviews workfile can be created using eviews_wfcreate() function in R.

eviews_wfcreate(wf = "eviews_wfcreate", page = "EviewsRPage",
    frequency = "m", start_date = "1990", end_date = "2022")

Create a workfile from a dataframe

eviews_wfcreate(source_description = Data, wf = "eviews_wfcreate1",
    page = "EviewsR_page", frequency = "m", start_date = "1990")

7.2.6 The eviews_wfsave() function

An EViews workfile can be saved various output formats using eviews_wfsave() in function in R.

eviews_wfsave(wf = "eviewsr_workfile", source_description = "wfsave.csv")

7.2.7 The exec_commands() function

A set of Eviews commands can be executed with the help of exec_commands() function in R.

exec_commands(c("wfcreate(wf=exec_commands,page=eviewsPage) m 2000 2022"))

eviewsCommands = "pagecreate(page=eviewspage1) 7 2020 2022
for %page eviewspage eviewspage1
pageselect {%page}
genr y=@cumsum(nrnd)
genr x=@cumsum(nrnd)
equation ols.ls y c x
graph x_graph.line x
graph y_graph.area y
freeze(OLSTable,mode=overwrite) ols
next"
exec_commands(commands = eviewsCommands, wf = "exec_commands")

7.2.8 The export_dataframe() function

Use export_dataframe() function to export dataframe object to Eviews.

export_dataframe(wf = "export_dataframe", source_description = Data,
    start_date = "1990", frequency = "m")

7.2.9 The import_equation() function

Import EViews equation data members into R, R Markdown or Quarto.

import_equation(wf = "EviewsR_workfile", page = "EviewsRPage",
    equation = "OLS")

To access the imported equation in base R:

7.2.10 The import_graph() function

Import EViews graph objects(s) into R, R Markdown or Quarto.

import_graph(wf = "eviewsr_workfile")

$EViews graphs imported using import\_graph() function$ $EViews graphs imported using import\_graph() function$

Figure 7.5: EViews graphs imported using import_graph() function

To import only graphs that begin with x:

import_graph(wf = "exec_commands", graph = "x*")

$EViews graphs that begin with X imported using import\_graph() function$ $EViews graphs that begin with X imported using import\_graph() function$

Figure 7.6: EViews graphs that begin with X imported using import_graph() function

7.2.11 The import_kable() function

Eviews tables can be imported as kable object by import_kable() function. Therefore, we can include the

import_kable(wf = "EViewsR_workfile", page = "EviewsRPage", table = "OLSTable",
    format = "html", caption = "Selected cells of EViews table imported using import_kable() function",
    range = "r7c1:r10c5", digits = 3)

Table 7.2: Selected cells of EViews table imported using import_kable() function
Variable	Coefficient	Std. Error	t-Statistic	Prob.
C	-0.301	0.261	-1.155	0.249
X	-0.051	0.014	-3.591	0.000

7.2.12 The import_series() function

Use import_series() function to import data from EViews to R as a dataframe. The function creates a new environment eviews, whose objects can be accessed via eviews$pageName.

import_series(wf = "eviewsr_workfile")

To access the series in base R:

eviews$eviewspage %>%
    head()

To import the series as an xts object:

import_series(wf = "eviewsr_workfile", series = c("x", "y"),
    class = "xts")

7.2.13 The import_table() function

Import EViews table objects(s) into R, R Markdown or Quarto.

To import all table objects across all pages

import_table(wf = "EviewsR_workfile")

To import specific table objects, for example OLSTable

import_table(wf = "EviewsR_workfile", table = "OLStable")

To import table objects on specific pages

import_table(wf = "EviewsR_workfile", page = " EviewsRPage")

To access the table in base R (eviews$pageName_tableName)

eviews$eviewspage_olstable

7.2.14 The import_workfile() function

Import EViews equation data members, graph, series and table objects(s) into R, R Markdown or Quarto. This function is a blend of import_equation(), import_graph(), import_series() and import_table() functions.

To import all equation, graph, series and table objects across all pages

import_workfile(wf = "EviewsR_workfile")

$EViews graphs automatically imported by import\_workfile() function$ $EViews graphs automatically imported by import\_workfile() function$

Figure 7.7: EViews graphs automatically imported by import_workfile() function

To import specific objects

import_workfile(wf = "exec_commands", equation = "ols", graph = "x*",
    series = "y*", table = "ols*")

To import objects on specific page(s)

import_workfile(wf = "exec_commands", page = "eviewspage eviewspage1")

To access the objects in base R:

eviews$eviewspage_ols  # equation
# eviewspage-x_graph # graph saved in 'figure/' folder
eviews$eviewspage %>%
    head()  # series
eviews$eviewspage_olstable  # table

7.2.15 The rwalk() function

A set of random walk series can be simulated in R using EViews engine, thanks to rwalk() function.

rwalk(wf = "eviewsr_workfile", series = "X Y Z", page = "", rndseed = 12345,
    frequency = "M", num_observations = 100, class = "xts")

xts::plot.xts(rwalk$xyz, type = "l", main = "")
ggplot2::autoplot(rwalk$xyz)

Figure 7.8: Plots of imported EViews random walk series objects

7.2.16 Demo

The demo files are included and can be accessed via demo(package="EviewsR")

demo(create_object())
demo(eviews_graph())
demo(eviews_import())
demo(eviews_pagesave())
demo(eviews_wfcreate())
demo(eviews_wfsave())
demo(exec_commands())
demo(export_dataframe())
demo(import_equation())
demo(import_graph())
demo(import_kable())
demo(import_series())
demo(import_table())
demo(import_workfile())
demo(rwalk())
demo(set_eviews_path())

EviewsR: A Seamless Integration of EViews and R

Sagiru Mati, PhD

Tuesday: November 28, 2023

1 About the Author

2 About EviewsR

3 Why EviewsR?

4 Installation

5 Setup

6 Usage