PROC FORMAT;
VALUE STATFMT 1='No Disturbance'
              2='Recent Disturbance'
              3='Current Disturbance';
/* 1000 square-meter plots are classified by level of feral hog */
/* disturbance in May 2001 (previous status) and July 2001 (current */
/* status). 'No disturbance' includes plots under water at the time */
/* of study. 'Previous disturbance' includes plots in which no */
/* new disturbance is present, but evidence of disturbance was */
/* present either for the current survey or the previous survey */
DATA HOG;
INPUT PREVIOUS CURRENT COUNT;
FORMAT PREVIOUS CURRENT STATFMT.;
CARDS;
1 1 446
1 2 .
1 3 128
2 1  49
2 2 185
2 3 104
3 1   0
3 2  75
3 3  13
PROC FREQ; WEIGHT COUNT;
TABLES PREVIOUS*CURRENT/NOROW NOCOL NOPERCENT MEASURES;
RUN;