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Text of the page (random words):
s i don t understand the settings so i just click ok the configuration window closes and two new windows open the bigger window is the g7 program the smaller one is a demo file there is no activity the g7 window tells my present working directory and provides the title of the data that s been loaded in looks like a setting in the configuration window determines which data gets loaded in the smaller window is more interesting you can read it this demo script provides the user with a solid foundation several lines of text there with a crosshatch before each line i guess we should call it a hash symbol now several lines a hash prefix then cls addp n cls means clear the screen i know that one that s from basic gw basic had the cls command back in the days of dos i don t know what the addp n is next there are several more lines of text ic if you have any trouble with this demo script but this time the lines all start with the letters ic instead of a hash symbol that tells me these lines are for a different purpose than those other lines of text when you run the script the lines with the ic prefix are displayed as text the lines with the hash symbol prefix are not displayed i conclude that the hash symbol means the line is a comment in the g7 language then there is the line pause when you are done reading click ok followed by another cls command back in the bigger window g7 i can type and see what i m typing but nothing happens when i press enter i played with this a bit and had a thought the smaller window is an editor the smaller window is for user input the bigger window is for g7 s output so then if enter doesn t work in the big window it s not a problem that window isn t for my input in g7 the bigger window across the top there is a toolbar with a few buttons g editor change directory change font i clicked on g reference a windows window popped up instead of the g reference the window said windows vista can t read older style windows help files there was a link to a download an enhancement to vista that lets me read the older help files it was easy to resolve this problem but file it under stupid problems windows can t read windows help files give me a break so now the g reference button opens the g reference and that ll be a handy thing i went there and went to the basic 11 g7 commands first as they suggest this is amazing look what they have for the f command f variable expression f variable date1 date2 expression defines variable on left in terms of variables in expression on right f x gnp 1 unemp 1 exp 25 time f index x x 85 1 note denotes lags t 1 is denoted 1 introduces a function see list of functions date on the right hand side denotes a specific observation date on the left hand side assigns values over the given range of periods first impression wow they give two forms for the f command shown in green the first one looks like a pretty simple assignment of value variable expression create a variable and assign a value to it simple everyday stuff you could find in any computer language right yeah but hold on a minute i read about the f command in the demo here s the relevant part of the demo script file ic ic how to form variables ic ic ic f variable expression ic ic a variable on the left hand side is defined as the expression on right hand ic side the new variable is stored in the workspace bank and can have ic any name for example if you wanted to create an index of rtlsales44111 ic using june of 2000 as its base type ic f index44111 a rtlsales44111 a rtlsales 2000 006 into the ic command line this new variable can be printed or graphed addp y f index44111 a rtlsales44111 a rtlsales44111 2000 006 ty index44111 gr index44111 addp n pause when you are done reading click ok cls the number 44111 identifies some particular data series sort of like tcmdo identifies a particular data series at fred you can make a variable that is an index of that series the line f index44111 a rtlsales44111 a rtlsales44111 2000 006 divides each value of the source data series by the june 2000 2000 006 means the sixth month of year 2000 divides each value by the june 2000 value of that series this creates a whole new data series that looks like the source series but with the june 2000 value shrunk down to 1 0 and all the other values shrunk down in proportion so the variable we create can be a whole new data series this is a big deal you ll often see me talk in those terms i might show you a graph of tcmdo divided by gdp that displays 50 years of quarterly data four values for each year so 200 values were used to make the graph but when i talk about how these values change over the years i say the number changed over the years as if it was just one number rather than 200 separate numbers just one number for a period of time just one variable in g7 but the variable holds a whole data series this is good stuff posted by the arthurian at 10 00 am 2 comments tuesday november 25 2014 installation i should have left the default this series of posts began on 18 november edit 3 december 2014 normally i don t change my posts this one has been undergoing major revision because i don t want to steer anyone wrong who might use it as an instllation guide so this isn t the same post it was at the start if you don t install g7 correctly it will give you problems i have to keep editing this post until i get the installation right i think we re there now but yeah i did think we were there before too inforum s the g7 regression program page is pretty friendly and you can download the g7 from there so that s where i went and clicked the shiny button to get g7 here that took me to the software downloads page then i clicked the blue pdg link for the stable version pdg exe 26 3 meg it s taking a few minutes the software downloads page says you have to unblock the file after the download while waiting i looked that up delay s blog says zip files should be unblocked before their contents are extracted http blogs msdn com b delay p unblockingdownloadedfile aspx technet says by default these files are blocked to protect the computer from untrusted files and wants you to review the file and its source and verify that it is safe to open i forgot to grab the technet link nobody says how you re supposed to know if something is safe the download took five minutes i moved the file to a temp folder unblocked it and ran it wherever you run the download file it creates a pdg folder and puts its files in that folder so my concern about littering c with files was unfounded it s a smart concern but it was unfounded when you run the pdg exe download file you get setup exe and a handful of related files i show a screen snip below i m using windows vista by the way and hoping to upgrade at christmas i didn t know what to do next but the software downloads page starts by saying to install g7 on a machine for the first time please follow the instructions on the g7 page so i clicked that and ended up back at the friendly page it says pdg this is a self extracting zip file of the g7 program and other inforum software after downloading this file run it by double clicking on it or by typing its name at a dos prompt do this in a temporary directory one of the files that will be extracted is setup exe next run this setup program and the installshield session will begin this will load the software into the default location of c pdg see the readme files that are included in the installation for further instructions so far so good next run setup exe the installshield wizard a pretty picture of a house or maybe the building that houses inforum comes up in the installshield wizard after clicking next a couple times a readme file comes up this is not like something that i might throw together myself it is all very professional trustworthy 307 file s unzipped successfully when you run setup exe you get those 307 files okay first you download a file named pdg exe and unblock it then you run it and wherever you run it by default it creates a folder named pdg and it puts a handful of files in there including setup exe it wanted to extract to c root c and this time i let it here is the result a handful of files including setup exe in a pdg folder then i ran the setup exe then you run setup exe and by default it creates a pdg folder in the root and puts 307 files there including g7 exe the file you want i let it install in c and here is the result of that the installed files are in a pdg folder which is in c it works if you let it oh good windows vista is given as an example of the environment you might be using for g7 the first stuff i read on this a few days back said windows xp or 7 or 8 but didn t mention vista so far so good then the readme says you have to add c pdg the path to where g7 will be installed to the windows path variable i did that right away because i wouldn t remember to do it after the installation is complete the instructions are right there in the readme and they are excellent i didn t have any question in any step of the process when they tell you to click ok they also tell you which window you should be in at the moment and i was in that window every time i think that s the best computer instructions i ever saw the instructions are very good my problems arose because i didn t trust them and i tried to do things to prevent problems my problems arose from my effort to prevent problems sad but true oh i m gonna quote this bit for later to employ some of the newest features in g7 your system must have an installation of the microsoft vc 2005 redistributable package you can find a copy of the vc installer under c pdg vc installer run the installer before attempting to run g7 run the installer before attempting to run g7 but after i install g7 which i didn t get to yet i m still reading the readme okay i m done with the readme there are some questions related to installation i just accept the defaults unless i see something odd i see something odd the installshield wizard s destination folder window by default will install g7 to the root directory c yeah and that is okay installshield will create the pdg folder in the root directory and that is what i want and will put all the installed files into the new pdg folder it will work fine it you let it leave installshield the default path c and you re good i clicked next the typical setup type installs everything that s the default and that s what i want now click install start 5 12 am after a moment the activity begins oh done at 5 14 readme yes yeah this is the same readme file that i read before i had to do something run the installer for vc okay now i can close the temp folder and the temp pdg folder and open c pdg vc installer is there it installs quickly but then there is a long delay while it says time remaining 0 seconds but the window closed while i was typing this okay close the vc installer folder close the readme window close the control panel window where i add pdg to the path now i don t know what to do run the thing i guess in the gdp folder i double clicked on g7 exe and two windows opened it s a demo the one window is the demo and the other is the script for the demo it looks like but nothing is happening in the script i see things like when you are done reading click ok but they don t show up in the demo maybe i have to run it i click the triangle symbol in the demo window menu the right pointing triangle the thing runs i get a paragraph of text and a when you are done reading click ok message okay posted by the arthurian at 6 30 am 1 comments monday november 24 2014 the first section of chapter 1 does not require the use of computers today s title is a quote from the craft of economic modeling part 1 pdf by clopper almon i take the quote to mean that i don t have to begin by getting into the modeling software they call g7 i take it to mean i can start with a spreadsheet not pencil and paper and slide rule page six of the craft presents table 1 1 a table of data to use for the first simulation for the first model i mean ten columns of numbers most of them are incomplete the first column which is complete contains the numbers 1 thru 24 in order it is labeled line meaning row number but i take it to represent years 1 thru 24 of the simulation i m going to create three other columns are also complete each with 24 values here we have numbers that are predetermined and invariant regardless of how the simulation works out these complete columns hold exogenous values those values don t depend on the outcome of the simulation in each of the six remaining columns only the first few numbers are filled in these are starter values a lot of them are used by the calculations of the model used by calculations to fill in the blanks where numbers are not given the calculations produce endogenous values if things go a little differently in the simulation if you change an exogenous value or if you change a calculation say the endogenous numbers will probably all change when i put the numbers into a spreadsheet i switched over to calculations as soon as i could that way i could compare my calculations to some of the givens and check my work in the zoho spreadsheet i show the numbers in blue if i used given values and black if i used calculations the table of numbers starts just below this graph check my work i was expecting my graph to come out like the one on page 5 but i only got two growth spurts they got five i checked my work and didn t see any mistakes oh there were mistakes but you look at the graph and see the date when it seems to go crazy and then you check your calculations on the rows around that date and you fix em before you put it on your blog i think i got all the mistakes but if you find anything fishy let me know i m assuming the page 5 graph was generated from different data and that s why the graphs don t match if you create the model yourself do let me know how it comes out note when you enter the equations it s easy to use the wrong column it s easy to confuse spreadsheet columns with economic data category columns for example the last spreadsheet column used here is column j which contains economic data column y disposable income it s a little messy keeping it straight but if you don t do it right you ll know because your graph won t look right this series of posts began on 18 november 2014 posted by the arthurian at 4 00 am 0 comments sunday november 23 2014 why to speak of cause and effect in economics one must have in mind some kind of model it may be an entirely subconscious model or a model spelled out in theory but never quantified or tested or an explicit quantified model that has been subjected to careful testing and scrutiny i need hardly add in which sort i have the greater confidence clopper almon posted by the arthurian at 4 00 am 0 comments friday november 21 2014 columns in a spreadsheet go up and down like columns in a building rows go across following up on the post of 18 november when...
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