Related Experiment Video
Updated: Aug 19, 2026

Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria
Published on: July 20, 2017
The dwelling conditions and procreative behaviours (a causal study on the example of individual farmers)
Abstract:
"The objective of the research was to identify relationships between the size of the dwelling place as defined by the number of its rooms and area, on one hand, and the parity attained in families of individual farmers who entered into marriages in the years 1926-84, on the other. The source material was derived from a sampling questionnaire survey conducted [in Poland] among 1,621 families of individual farmers keeping agricultural accountancy as on 1 January 1985.... The size of the dwelling expressed by its average size in the period from the day of the marriage to the birth of the last child and at the moment of observation is more significant for explaining the parity of families than the size of the dwelling in the first year following the marriage."
More Related Videos
Related Concept Videos
Life Histories
Case Studies
Naturalistic Observations
Data Collection by Observations
An astronomer viewing the motion and brightness of stars in the sky and recording the data is an example of observational data collection. A botanist recording...
Study Design in Statistics
Does aspirin reduce the risk of heart attacks? Is one brand of fertilizer more effective at growing roses than another? Is fatigue as dangerous to a driver as the influence of alcohol? Questions like these are answered using randomized experiments with proper...
Observational Studies
There are three types of observational studies – Prospective, retrospective, and cross-sectional.
Prospective Study
Prospective studies, also known as longitudinal or cohort studies, are carried out by collecting future data from groups sharing similar characteristics. One example of...

