Example 3.1. Gretl data files. Pilar González and Susan Orbe. Dpt. Applied Economics III (Econometrics and Statistics)

Transcription

1 Example 3.1 Gretl data files Pilar González and Susan Orbe Dpt. Applied Economics III (Econometrics and Statistics) Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 1 / 57

2 Contents New data set. Entering data values. Exporting data Importing data. Importing data from Excel. Modifying the structure of the data set Loading a Gretl user file. Editing attributes Loading a sample file. Writing some notes. Saving a Gretl session. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 2 / 57

3 Contents New data set. Entering data values. Exporting data Importing data. Importing data from Excel. Modifying the structure of the data set Loading a Gretl user file. Editing attributes Loading a sample file. Writing some notes. Saving a Gretl session. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 3 / 57

4 Example New data set. Chicken consumption. The table below shows annual data from 1990 to 2011 on chicken consumption per capita (Y, in kilograms), disposable income per capita (X2, in euros) and price of chicken (X3, in euros/kilogram). a. Create a new Gretl data file and enter these data manually. b. Save the data in a Gretl file called chicken.gdt. c. Export the data to CSV format. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 4 / 57

5 Example Entering data values. To create a new data set, go up to the Menu Bar and click File > New data set Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 5 / 57

6 Example Entering data values. Write the number of observations (22) and click OK. Select the structure of the dataset (Time series) and click Forward. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 6 / 57

7 Example Entering data values. Select the time series frequency (annual) and click Forward. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 7 / 57

8 Example Entering data values. Select the starting observation (1990) Confirm the data set structure, 1990 to 2011 and select start entering data values Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 8 / 57

9 Example Entering data values. Give a name to the variable and click OK Start entering the data values Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 9 / 57

10 Example Entering data values. Once finished entering the data for variable Y, click on the icon Apply and click on the icon + to add a new variable Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 10 / 57

11 Example Entering data values. Write the name of the new variable (X2) in the dialog window. Enter the data of variable X2 and then repeat the whole procedure for variable X3. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 11 / 57

12 Example Entering data values. Once finished entering the data, click on the icon Apply The main window shows the three variables included. Note that the data are not saved yet! Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 12 / 57

13 Example Entering data values. To save the data in Gretl format, go up to the Menu Bar and click File > Save data Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 13 / 57

14 Example Entering data values. Select a folder to save this data set. In this example, the file will be saved in the Desktop. Write the name of the file with a.gdt extension (chicken.gdt) and click Save at the bottom of the window. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 14 / 57

15 Example Entering data values. Once the file has been saved, its name (chicken.gdt) appears in the main window below the Menu Bar. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 15 / 57

16 Example Exporting data. Data can be saved in other formats such as csv, PcGive, Octave,... This is called export data. Select the Export data option from the File pulldown menu. File > Export data Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 16 / 57

17 Example Exporting data. Select the variables to export Select a format for the file (CSV) Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 17 / 57

18 Example Exporting data. Select the characteristics of the csv file and click OK. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 18 / 57

19 Example Exporting data. Select a folder to save the file (Desktop), write the name of the file (chicken.csv) and click Save. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 19 / 57

20 Example Once finished, to quit Gretl, go up to the Menu Bar and select File > Quit Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 20 / 57

21 Example Before quitting, Gretl asks you some questions: Do you want to save all the commands executed? To save the commands, click Yes. Do you want to save changes in the data set? To save this changes, click Yes. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 21 / 57

22 Contents New data set. Entering data values. Exporting data Importing data. Importing data from Excel. Modifying the structure of the data set Loading a Gretl user file. Editing attributes Loading a sample file. Writing some notes. Saving a Gretl session. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 22 / 57

23 Example Importing data. Visitors to Bilbao. The manager of the Bilbao Tourist Office wants to study the evolution of tourism using data on visitors to Bilbao: TV: Total number of visitors. SPV: Visitors coming from Spain. FV: Foreign visitors. These data may be found in the file tourism.xls, in the sheet called series. a. Load these data into Gretl. b. Save the data in a Gretl file called tourism.gdt. Visitors c. Later you learn that these data are time series data from March 1993 until December Change the data structure of the file tourism.gdt to time series data. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 23 / 57

24 Example Importing data from Excel. To import data from other files, in this case an Excel file, go up to the Menu Bar and click File > Open data > User file... Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 24 / 57

25 Example Importing data from Excel. Select the folder where your Excel file is (in this example in a Desktop folder called Files). Select the file tourism.xls and click Open at the bottom of the window. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 25 / 57

26 Example Importing data from Excel. Select: the Excel file sheet where the data are (Visitors series). the column and the row where the data start (including the row with the names of the variables). Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 26 / 57

27 Example Importing data from Excel. The dialog box asks about the type of data you are importing. By default, Gretl interprets the data as cross-sectional. If you know that your data file consists of time series data, click Yes and then give information about the structure of the data. At the moment, the structure of the data in the file tourism.xls is unknown, therefore keep the default option (cross-section data) clicking No. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 27 / 57

28 Example Importing data from Excel. Once the process is finished, the main window shows the three variables imported. Note that these data are not saved yet in Gretl format. The name of the file is still tourism.xls. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 28 / 57

29 Example Importing data from Excel. File > Save data as... Select the folder where you want to save the data file and write the name, tourism.gdt. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 29 / 57

30 Example Modifying the structure of the data set. To modify the structure of a data set, select the option Dataset structure... from the Data pulldown menu. Data > Dataset structure... Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 30 / 57

31 Example Modifying the structure of the data set. Select the structure of the data set Select the time series frequency Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 31 / 57

32 Example Modifying the structure of the data set. Select the starting observation Confirm the data set structure Don t forget to save all the changes in the file tourism.gdt before quitting Gretl! Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 32 / 57

33 Contents New data set. Entering data values. Exporting data Importing data. Importing data from Excel. Modifying the structure of the data set Loading a Gretl user file. Editing attributes Loading a sample file. Writing some notes. Saving a Gretl session. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 33 / 57

34 Example Loading a Gretl user file. Chicken consumption. a. Load the data file chicken.gdt saved in Example into Gretl. b. Verify the data values you entered in Example c. Save these data in.doc format. d. Label the variables in the file. e. Save all the changes in the data file chicken.gdt. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 34 / 57

35 Example Loading a Gretl user file. To load one of your own Gretl data files, go up to the Menu Bar and select File > Open data > User file... Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 35 / 57

36 Example Loading a Gretl user file. Select: the folder where your Gretl file is (in this example, the Desktop). select the file chicken.gdt, among all the Gretl files you may have, and load it using the button Open at the bottom of the window. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 36 / 57

37 Example Loading a Gretl user file. The easier way to verify the data values is to highlight the desired variables and execute a right mouse click. This brings up a pulldown menu that allows you to do a number of things. Select the option Display values. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 37 / 57

38 Example Loading a Gretl user file. The display data window shows the data for the three selected variables and a menu bar with a number of icons. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 38 / 57

39 Example Loading a Gretl user file. gretl: display data The menu bar enables us to Save data in different formats: RTF (MS Word), tab separated, comma separated and plain text. Print data in any selected printer. Copy data in different formats: RTF (MS Word), tab separated, comma separated and plain text. In this way, it is possible to paste these data directly to another file. Find a specific value, category, name of the variable,... Sort data by a variable of interest. Reformat data. There are two options: to keep the standard format or to indicate how many significant figures or decimal places we want to show. Windows. With this option it is possible to open another Gretl window, for instance, the main window. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 39 / 57

40 Example Loading a Gretl user file. To save the three variables in a.doc file, click on the left icon (Save) in the menu bar of the gretl: display data window. Then, select a format, for instance, RTF (MS Word). Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 40 / 57

41 Example Loading a Gretl user file. Select the folder where you want to save the data file and write the name, chicken.doc. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 41 / 57

42 Example Editing attributes. Note that the Descriptive label column is blank for the three variables. To label one variable (for instance, Y ), first highlight the variable with the cursor. Then you have two alternatives: a. go up to the Menu Bar and click Variable > Edit attributes b. right-click the highlighted variable and select the option Edit attributes. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 42 / 57

43 Example Editing attributes. This yields a dialog box where you can assign variable descriptions and display names. Write the description of the selected variable and click on the icon Apply. Then, to label another variable, click on the icon Next series. Finish by clicking OK at the bottom of the window. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 43 / 57

44 Example Editing attributes. The main window shows the three variables with their labels. Do NOT forget to save all the changes to the file chicken.gdt before quitting Gretl! Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 44 / 57

45 Contents New data set. Entering data values. Exporting data Importing data. Importing data from Excel. Modifying the structure of the data set Loading a Gretl user file. Editing attributes Loading a sample file. Writing some notes. Saving a Gretl session. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 45 / 57

46 Example Loading a sample file. Pizza consumption. Load the file pizza4.gdt you may find in the sample folder POE4th ed. (Hill, Griffiths and Lim (2003)). a. Change the name of some variables: female to F, hs to HS, college to C and grad to P. b. Write some notes about the work done so far and save them in the session. c. Save the session with the name Sespizza. d. Save all the changes in the Gretl file pizza.gdt. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 46 / 57

47 Example Open a sample file. To load a file from one of the Gretl folders, go up to the Menu Bar and use File > Open data > Sample file... Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 47 / 57

48 Example Loading a sample file. Select the tab POE 4th ed. and highlight the file pizza4 using the cursor. Double-click in order to load this file. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 48 / 57

49 Example Loading a sample file. The main window shows all the variables included in the file and their labels. The name of the data file loaded, pizza4.gdt, may be found below the Menu Bar. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 49 / 57

50 Example Loading a sample file. To change the name of a variable, select the variable, go to the Menu Bar, click Variable > Edit attributes and follow the procedure shown in Example Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 50 / 57

51 Example Loading a sample file. The main window shows the variables with their new names. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 51 / 57

52 Example Writing some notes. To introduce some notes about the work done, click on the icon session icon view in the main window Toolbar and double-click on the icon Notes. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 52 / 57

53 Example Writing some notes. This yields a window that is empty. Write the text and click on the left icon (Save) in the menu bar of the session notes window. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 53 / 57

54 Example Save a Gretl session. To save the session, go up to the Menu Bar and click File > Session files > Save session Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 54 / 57

55 Example Save a Gretl session. Select a folder to save the session (in this example, the Desktop), write the name of the session, Sespizza, and click Save. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 55 / 57

56 Example Save a Gretl session. Once the session is saved, its name appears at the top of the main window: Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 56 / 57

57 Example Open a sample file. To save all the changes in your own data file: Select the option Save data as... from the File pulldown menu: File > Save data as... Select a folder to save the file (in this example, the Desktop). Write the name of the file, pizza.gdt, and click Save. Pilar González and Susan Orbe OCW 2014 Example 3.1 Gretl data files 57 / 57