Data, sampling, and variation in data and sampling

... chance of being included in the sample Random sampling methods include simple random sampling, stratified sampling, cluster sampling, and systematic sampling Convenience sampling is a nonrandom method ... there is variation in data, there is variation in samples As you become accustomed to sampling, the variability will begin to seem natural 17/40 Data, S...

Ngày tải lên: 19/10/2016, 22:03

... frequency of preeclampsia in the dry and wet seasons that occur in Zimbabwe [12] All these studies have assessed if there was a seasonal variation in the incidence of preeclampsia Interestingly Phillips ... et al, in their study, have evaluated the link between the timing of conception with risk of preeclampsia [13] They found the highest risk of pre...

Ngày tải lên: 13/02/2014, 06:20

... of cholinesterases in mouse kidney [32] and MDCK cells [33], and, more recently, of ACh and cholinergic receptors in the human urothelium [34], the expression of cholinesterases in human kidney ... Munoz-Delgado et al ˜ Cholinesterases in renal carcinomas Fig Lectin interaction patterns of cholinesterases of human kidney, erythrocytes, and blood...

Ngày tải lên: 06/03/2014, 22:21

... (1035) 5.5- 6.3 46 Arkansas 5.4 ( 755) 5.0- 5.8 Maryland No data available Mississippi No data available Tennessee No data available Virginia No data available Wisconsin No data available Source: U.S ... Rhode Island) Of the five states with the lowest rates, four are in the southeast U.S (Arkansas, North Carolina, Alabama, and South Carolina) Table Thyroid Cancer Incidence, by Stat...

Ngày tải lên: 15/03/2014, 01:20

... Life-history trade-offs affect the costs and benefits of staying within the natal group and engaging in helping activities, versus leaving the group and refraining from helping, and therefore may explain ... of carrying sand away from the shelters in a 10-min observation for each focal (‘digging alone’) In the evening of the same day, a large male and female was added,...

Ngày tải lên: 28/03/2014, 16:20

... ecological zones (valley, hill and intermediary level), allowing a detailed investigation of both species and local environmental effects MATERIALS AND METHODS 2.1 Wood sampling The sampled stand ... zones: a small valley, a plateau and a regular intermediate slope The plateau is covered by a well drained soil and composed of sand and slit The small valley is characte...

Ngày tải lên: 07/08/2014, 16:20

... report data on the within and betweentree variability of sapwood and heartwood in four commercial plantations of E globulus at the time of harvest for pulp production, and analyse the in uence of ... factors The decomposition of the variance by sources of variation showed that the effect of height level explained between 85% and 88% of the tot...

Ngày tải lên: 07/08/2014, 16:21

... lack of significant differences in kino among genotypes indicated that breeding is unlikely to be a useful means of reducing kino in plantation grown E globulus However, the assessment of kino induced ... longitudinal variation in kino score may have been due to longitudinal variation in physiology, longitudinal variation in the risk of injury to the cambium [1...

Ngày tải lên: 07/08/2014, 16:21

... seeds/ha/yr of B berchemiaefolia, only 406 000 seeds developed into seedlings Of these seedlings, 630 individuals grew into saplings and finally only individuals developed into mature trees These results ... some trees are left after harvest to regenerate the stand, diversity of their offspring may be affected In other words, if only a few trees are left to serve as seed parents,...

Ngày tải lên: 08/08/2014, 01:21

... properties of the wood, and thus quantify the importance of the individual factors contributing to the natural durability of Scots pine wood The variation in the in vitro decay rate, and in the extractive ... the heartwood The other marked difference between the outer and the inner heartwood found in the present study was in the concentrati...

Ngày tải lên: 08/08/2014, 01:21

... foliage in 1997 (slope –0.0223, P < 0.05) 3.2 Effects of atmospheric evaporative demand, leaf water status and plant hydraulic conductance The effects of atmospheric evaporative demand and plant hydraulic ... the data obtained in 1997, accounting for the interactive effects of irradiance, VPD, and plant hydraulic conductance, described 83.3–89.0%...

Ngày tải lên: 08/08/2014, 01:21

... considering other determinants In the inner rings below m (classes 1, and 5), the relationships were slightly poorer than in the other positions and in C and C the , coefficients a and b of the regressions ... percentage of earlywood, no real latewood and a higher intra-ring homogeneity) and which can induce a different behaviour during the indentation of...

Ngày tải lên: 08/08/2014, 14:21

... contrasts with the variation of roburins A and C Roburin A increases in concentration during the first 10 years of ageing and roburin C over the first 30 years, before each declines again in older ... degree of variation in ellagitannin concentrations that occurs between trees, populations and the two European oak species Q petraea (Matt) and Q r...

Ngày tải lên: 08/08/2014, 18:21

... Quercus robur L and Q pe(Matt) Liebl: a multivariate approach to the hybrid problem Data acquisition analysis and interpretation Watsonia 12, 81-101 Rushton BS (1983) An analysis of variation of traea ... 18 and 25 mm in sessile oak This variation covers about 60% of the trees classified here as pedunculate oaks and only 30% of the sessile oaks The qu...

Ngày tải lên: 08/08/2014, 19:21

... characterize juvenile Quercus populations but not the succeeding life stages The genetic multiplicity was very large in all samples investigated including single-population samples This finding concurs ... différences entre elles Les populations prises individuellement partagent une partie plus faible de l ensemble du pool génétique que les populations regroupées entre elles Le...

Ngày tải lên: 08/08/2014, 19:21