DATA QUALITY - AN EXAMINATION OF THE TRANSLATED DATA FOR DAR, ARUSHA AND MOSHI 1989 - 1994
Analysis of raw data
1. There are 19158 raw data points for 505 market-days for the 3 major sites over the period 1989-94.
2. Ideally, for each market day, there will be at least one data point for each of the 15 GSC's, i.e. information for 15 GSC's for each market-day; in reality the average is 7 GSC's per market-day.
3. An examination of the frequencies for the 15 GSC's show that Bull 4, Cow 4, Bull 0, Steer 4, Cow 0, Bull3, Cow 3, Steer 3, Steer 0, Cow 1, Bull 1, Bull 2, Cow 2, Steer 1 and Steer 2 is the sequence of increasing occurrence (Bull 4 is least represented, and Steer 2 is most represented in the data).
|
Average sample size per market day (for market days with sample size > 0) |
Number of market-days with sample size > 0 (out of 505 total market-days). |
Number of data points (out of 19158 total data points with weight and price). |
%age of total population |
|
|
Steer grade 0 |
3 |
270 |
912 |
4.8% |
|
Steer grade 1 |
9 |
464 |
4167 |
21.8% |
|
Steer grade 2 |
11 |
481 |
5340 |
27.9% |
|
Steer grade 3 |
4 |
270 |
1009 |
5.3% |
|
Steer grade 4 |
4 |
98 |
412 |
2.2% |
|
Cow grade 0 |
2 |
107 |
177 |
0.9% |
|
Cow grade 1 |
3 |
316 |
952 |
5.0% |
|
Cow grade 2 |
6 |
418 |
2332 |
12.2% |
|
Cow grade 3 |
3 |
227 |
610 |
3.2% |
|
Cow grade 4 |
2 |
71 |
115 |
0.6% |
|
Bull grade 0 |
2 |
85 |
145 |
0.8% |
|
Bull grade 1 |
3 |
323 |
936 |
4.9% |
|
Bull grade 2 |
4 |
384 |
1608 |
8.4% |
|
Bull grade 3 |
2 |
161 |
364 |
1.9% |
|
Bull grade 4 |
2 |
48 |
77 |
0.4% |
|
All |
Avg = 4 |
Total=19158 |
Table: Sample and Population by Grade-Sex Combination for Dar, Arusha and Moshi 1989 - 1994 inclusive.