| Proposed Estimators of R |
|
|
|
|
| 1 | 0 | 0 |
|
| 1 | b | 0 |
|
| 1 | 0 | 1 |
|
| 1 | 0 | ‒1 |
|
| 0 | 0 | 0 |
|
| 0 | b | 0 |
|
| 0 | 0 | 1 |
|
(regression-type estimator based on both |
| 1 | 0 |
|
|
| 0 | 1 |
|
(regression-cum-ratio type estimator based on both |
| 1 | 1 |
|
(regression-cum-product type estimator based on both |
| 1 | ‒1 |
(the customary ratio estimator based on
)
(regression-type estimator based on
)
(ratio-type estimator based on
)
(product-type estimator based on 
or
)
(simple ratio estimator based on
)
(regression-type estimator based on
)
(ratio-type estimator based on
)
and
)
(ratio-type estimator based on both 
and
)
and
)
and
)