'===========================================================================
' Subject: FREQUENCY ANALYSIS PROGRAM        Date: 02-14-98 (15:03)       
' Author:  Bert van Dam                      Code: QB, QBasic, PDS        
' Origin:  bd1rsd@usa.net                  Packet: ALGOR.ABC
'===========================================================================
'Frequency analyses program by Bert van Dam, 1998. You can
'contact me at BD1RSD@USA.NET of in the Fido QUIK_BAS echo.
'This program is donated to the public domain.

'If you use creativity when filling in your tax forms you have a
'natural tendency to like some numbers more than others. You may
'for example be more inclined to use a 3 than a 5, without
'knowing it. This tendency helps the tax office to spot your
'creativity, and result in more attantion to your data than you
'might like.

'This programs makes a statistical analyses of all numbers (and
'letters if you like) in a document file. First make an analyses
'of your untampered previous files to get the normal distribution
'for your line of business (for example in a grocery shop price
'list the numbers 9 and 5 naturally occur more often, as in prices
'such as 19.95). Then perform the same analyses on a tampered
'file. If you see any differences your taxform needs some more
'work....

DIM soort(125)
kat = 0
CLS
PRINT "          FREQUENCY ANALYSES PROGRAM OF ASCII FILES"
PRINT
LOCATE 9, 1
PRINT "Enter path and file name, for example c:\data\freq.doc"
LINE INPUT ""; bestand$
letter$ = STRING$(1, " ")
PRINT : PRINT
PRINT "Evaluate numbers (C) or include letters (L) ";
kat$ = INPUT$(1)
IF INSTR(kat$, "c") <> 0 OR INSTR(kat$, "C") <> 0 THEN kat = 1
OPEN bestand$ FOR BINARY AS #1
wacht = 25
soort = 0
filegemaakt = 0
DO UNTIL EOF(1)
        nummer = nummer + 1
        LOCATE 20, 20
        PRINT "Reading character "; nummer
        GET #1, , letter$
        FOR counter = 1 TO 3
                IF counter = 1 THEN
                        start = 48
                        einde = 57
                END IF
                IF kat <> 1 AND counter = 2 THEN
                        start = 65
                        einde = 90
                END IF
                IF kat <> 1 AND counter = 3 THEN
                        start = 97
                        einde = 122
                END IF
                FOR teller = start TO einde
                        IF letter$ = CHR$(teller) THEN
                                soort(teller) = soort(teller) + 1
                                totaal = totaal + 1
                        END IF
                NEXT teller
                IF kat = 1 THEN counter = 4
        NEXT counter
LOOP
CLOSE #1
CLOSE #2
CLS
PRINT "          FREQUENCY ANALYSES PROGRAM OF ASCII FILES"
spatie = 1
regel = 1
FOR counter = 1 TO 3
        IF counter = 1 THEN
                start = 48
                einde = 57
        END IF
        IF kat <> 1 AND counter = 2 THEN
                start = 65
                einde = 90
        END IF
        IF kat <> 1 AND counter = 3 THEN
                start = 97
                einde = 122
        END IF
        FOR teller = start TO einde
                regel = regel + 1
                LOCATE regel, spatie
                PRINT "Char. "; CHR$(teller);
                soort(teller) = (soort(teller) / totaal) * 100
                PRINT " freq. ";
                PRINT USING "###"; soort(teller);
                PRINT " %."
                IF regel = 22 THEN
                        regel = 1
                        spatie = spatie + 25
                END IF
        NEXT teller
        IF kat = 1 THEN counter = 4
NEXT counter
END