Quality Research in Literacy and Science Education

International Perspectives and Gold Standards

AvMack C. Shelley,Larry D. Yore

Häftad, Engelska, 2010

1 560 kr

Skickas . Fri frakt över 249 kr.

Beskrivning

Statistical models attempt to describe and quantify relationships between variables. In the models presented in this chapter, there is a response variable (sometimes called dependent variable) and at least one predictor variable (sometimes called independent or explanatory variable). When investigating a possible cause-and-effect type of relationship, the response variable is the putative effect and the predictors are the hypothesized causes. Typically, there is a main predictor variable of interest; other predictors in the model are called covariates. Unknown covariates or other independent variables not controlled in an experiment or analysis can affect the dependent or outcome variable and mislead the conclusions made from the inquiry (Bock, Velleman, & De Veaux, 2009). A p value (p) measures the statistical significance of the observed relationship; given the model, p is the probability that a relationship is seen by mere chance. The smaller the p value, the more confident we can be that the pattern seen in the data 2 is not random. In the type of models examined here, the R measures the prop- tion of the variation in the response variable that is explained by the predictors 2 specified in the model; if R is close to 1, then almost all the variation in the response variable has been explained. This measure is also known as the multiple correlation coefficient. Statistical studies can be grouped into two types: experimental and observational.

Produktinformation

Utforska kategorier

Recensioner i media

Innehållsförteckning

Hoppa över listan

Du kanske också är intresserad av

Tone Schunnesson - Ultravåld, Inbunden
  • -19%

Ultravåld

Tone Schunnesson

Inbunden, 2026

4,4 utav 5 stjärnor. Totalt antal röster:(10)

209 kr259 kr

Éric Vuillard - Dagordningen, Pocket

Dagordningen

Éric Vuillard

Pocket, 2021

4,2 utav 5 stjärnor. Totalt antal röster:(23)

99 kr

David Szalay - Kött, Inbunden
  • -23%

Kött

David Szalay

Inbunden, 2026

4,5 utav 5 stjärnor. Totalt antal röster:(17)

199 kr259 kr

Jens Ganman - Skjut Gräv Tig, Häftad
  • -17%
Del 2

Skjut Gräv Tig

Jens Ganman

Häftad, 2026

4,8 utav 5 stjärnor. Totalt antal röster:(106)

189 kr229 kr