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- Statistics (LozStats) Manual Version 2.30
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- DISTRIBUTION:
-
-
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- Statistics version 2.30 is public domain. Anyone can use it
- and you are free to distribute it - as long as you're not
- making pots of money out of it! This version allows 20
- variables and 150 cases.
-
-
-
- Unfortunately it's still a bit rough around the edges.
- Considerable development time was wasted because of a bug in
- HiSoft Basic 2.00 that HiSoft were unwilling to resolve. As
- a result I had to change to Blitz Basic 2.10 which is faster
- but has required a massive conversion effort.
-
-
-
- I'm sorry but I accept no responsibility for any
- difficulties (crashes, inaccurate results etc.) you
- encounter, as a result of using this software. If you have
- any problems drop me a line and I'll see what I can do.
-
-
-
- Contact .............. Lawrence Harrell
-
- BNR Consulting,
-
- drlove@ibm.net
-
-
-
- BNR CONSULTING:
-
-
-
- BNR Consulting are a group of freelance market analysts,
- economists and transport/travel/tourism specialists with
- worldwide experience. Depending on other commitments, we
- are available as contractors and to conduct research for
- clients in any part of the world - at competitive rates.
- Particular specialties include:
-
-
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- ~ Demand forecasting (prediction of consumer behaviour).
-
- ~ Designing, analysing and conducting market surveys
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- ~ Report writing and presentation.
-
- ~ Stated Preference (Conjoint analysis).
-
- ~ Public transport planning
-
- ~ Computer demand models (basic programming and
-
- spreadsheets).
-
-
-
- For further information contact me at the above address.
-
-
-
- INTRODUCTION:
-
-
-
- I can only remember seeing one other statistics package on
- the Amiga and that was in the early days (around 1987) and
- it cost several hundred pounds. Although a number of
- spreadsheets are available, none compare with Microsoft
- Excel or Lotus 1-2-3 for (ugh!) Windows and spreadsheets are
- not that easy to use for statistical analysis.
-
-
-
- I do not intend to explain the statistical theory of the
- tests - if you do not understand what the program is for -
- this package is not for you. A good easy to understand
- statistics book to accompany the program would be: "Business
- Statistics, A Decision Making Approach" (1985) D.F. Groebner
- & P.W. Shannon, published by Merrill.
-
-
-
- INSTALLATION:
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-
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- The program can be installed on hard disk or copied to your
- own floppy disks. Please note that the program requires the
- Topaz 11 font to be present in the Workbench "Fonts"
- directory. Topaz 11 is provided on all Amiga systems.
-
-
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- BASIC OPERATION
-
-
-
- Upon loading the program you are presented with the data
- entry screen. If you have a compatible statistics file that
- you wish to work on, select "load" from the pull down menu
- and load the file. If you are creating a new file, select
- "add variable" from the pull down menus. Continue until all
- variables have been entered. Next select "add cases" and
- type in the number of cases in your data set. If you are
- not sure how many cases there are - type in an estimate (it
- is easy to add or delete cases later). Your data entry
- template is now complete.
-
-
-
- Until the data has been entered all cells are filled with
- the missing value, cells containing missing values are
- ignored in the analysis. You can select the number that
- represents the missing value from the pull down menus. The
- default value is 99.
-
-
-
- To enter/edit data move the cursor to the cell you wish to
- change using the arrow keys. Now type the appropriate
- number and move to another cell. The number is
- automatically entered when an arrow key is pressed (you do
- not need to press enter). Note that the number you have
- type will not appear upon the screen until an arrow key is
- pressed.
-
-
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- Now that the data is in, it can be analysed by selecting
- "analysis" from the menus. A number of options are
- available and most basic statistics (average, standard
- deviation etc.) are produced using the "basic stats" option.
- The best approach is to play around with the data set
- provided (Test.sts) and see what happens.
-
-
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- IMPORT/EXPORT OF DATA:
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-
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- One casualty of the enforced rewrite has been the loss of
- the import/export facilty available in previous versions. I
- hope to reinstall this in a later version.
-
-
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- LIMITATIONS - READ CAREFULLY!!
-
-
-
- The program will not accept negative numbers and all
- variables must have the same number of cases. The same
- missing value has to be used for every variable. If you
- enter very large numbers i.e. above 9999,999.00 screen
- formatting can become a bit dodgy. Entering huge values
- (like population figures) is best done by inputting, e.g.
- 12.1 for 12.1 million etc.. Although you can enter values
- with more than two decimal places and they will be used in
- the calculations - they will not be displayed in the editor.
-
-
-
- The display is setup for NTSC 640*400. If you have a
- monitor or SCART T.V. you may find that setting your
- workbench screen to NTSC (Workbench 2.04+ only) makes the
- screen more readable as well as saving memory and reducing
- flicker. To do this move the NTSC monitor into your
- devs/monitor drawer. Add the line "sys:devs/monitors/NTSC"
- to your startup-sequence immediately before the line
- "LoadWB". Now double click on the NTSC picture in
- devs/monitors and go to prefs/screenmode. Select NTSC Hires
- laced and then save. Now reboot. You may have to adjust
- the workbench palette a bit to reduce flicker. As you would
- expect I accept no responsibility if it blows up your
- monitor, but it works on mine!
-
-
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- Very minimal graphics are included and at present results
- cannot be output to a printer. One very cludgy way around
- this is to use a screen dump program. You will make best
- use of the program if you have a spreadsheet, such as Lotus
- 1-2-3 (on an emulator) or VIP Professional (very old). Any
- graphs, barcharts etc can be produced using a spreadsheet.
- I see no point in spending hours duplicating the graphing
- facilities of the above spreadsheets.
-
-
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- The software is reasonably crashproof (I have used it a lot
- with large data sets over the last nine years and during my
- Ph.D.). The production of the later versions has resulted
- in some substantial changes to code and some new bugs may
- have been created. Furthermore if you try silly things -
- you may be able to crash the program, so save your data
- regularly. If you register by email I can let you know
- about upgrades.
-
-
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- If you want to moan: remember what you paid for this program
- and how much statistical software can cost!
-
-
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- FUTURE:
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-
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- I hope to iron out any further bugs and add: better help,
- data labels, spreadsheet import/export and a large number of
- non-parametric routines - that have already been written
- (released as part of version 1.00). Significant development
- is only likely to occur as a result of a switch to another
- OS eg: BeOS, pOS of MacOS...
-
-
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- VERSION 1.10 ENHANCEMENTS:
-
-
-
- A number of changes have been made to the, 'Main' module
- with this upgrade.
-
-
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- The program has been made more multi-tasking friendly and is
- less processor hungry when waiting for user input.
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- There is a new title screen.
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- Control of the display while viewing data has been improved.
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-
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- The amount of data that the module can handle has been
- increased from 300 to 500 values.
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-
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- A number of bugs have been removed from the regression
- module that could give rise to, 'division by zero errors'.
-
-
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- The correlation matrix display has been enhanced.
-
-
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- A disk swapping bug causing, 'unknown volume' error has been
- cured.
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- Some preparations have been made to merge the two modules at
- a later date.
-
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- The Regression predictions section now works correctly and
- is more closely linked to the generation of the regression
- equations.
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- Finally it is easier to increase the number of cases in the
- data.
-
-
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- VERSION 2.00 ENHANCEMENTS:
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- Program sets up its own hi-res interlace screen with flicker
- minimising palette and selects Topaz 11 font for a
- consistent appearance on all systems.
-
-
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- Better presentation and more user friendly.
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-
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- Many algorithms speeded up.
-
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- Improved error trapping and a number of bugs removed.
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- Vastly improved data entry/editing.
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- Pull-down menus.
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- Ability to conduct analysis on single variables added.
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-
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- Independent t test, coefficient of variation, minimum, range
- and pooled standard deviation added.
-
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- Speech removed, beeps added.
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- Improved export of data.
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- VERSION 2.10 ENHANCEMENTS:
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- Various bug fixes.
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- ARP file requester added.
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- Data recode added.
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- Text input area cleared after error.
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- Data transform debugged and moved to data entry module.
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- VERSION 2.20 ENHANCEMENTS:
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- Fixed bug in add variables module.
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- Added Cross-tabs.
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- Improved User-interface.
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- VERSION 2.30 ENHANCEMENTS:
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- Rewritten for Blitz Basic 2.10, significantly faster.
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-