Surveying roaming dog populations: guidelines ... - Animal Sheltering

CONTENTS
2. Choose one of the four letters or colours at random; hence selecting all the blocks assigned that
letter or colour. This will provide a random sample spread out across the city. Each block’s
probability of being selected for the sample will be the number of selected blocks divided by the
total number of blocks. This will be approximately 1/4 and exactly 1/4 if the total number of blocks
is divisible by 4. See figure 3 for an example of where one colour (red) has been selected. If this
sample is too large to count continue to the next step.
COUNTING DOGS
IN PUBLIC AREAS
MONITORING ONCE
INTERVENTION BEGUN
Figure 3. All red blocks selected, each block had a ¼
(27 red blocks divided by the total of 108 blocks) chance of
being selected.
3. Number each of the selected blocks working as much as possible across and down the map, as if
reading words from a page. See figure 4 for an example of numbering selected blocks.
CONCLUSIONS
INTRODUCTION
Figure 4. All 27 red blocks numbered in order from left
to right and downwards.
ANNEXES
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