Samenvatting Statistiek Voor Bedrijfswetenschappen (Y50234)
305 views 1 purchase
Course
Statistiek Voor Bedrijfswetenschappen (Y50234)
Institution
Katholieke Universiteit Leuven (KU Leuven)
Werd hier reeds 11 keer verkocht, maar helaas door ze 1x gratis te maken zie je niet meer dat deze al 11 keer verkocht werd. Ook alleen maar positieve recensies!
Dit is een volledige samenvatting van de cursus en lessen statistiek van het AJ . De cursus staat volledig in het Engels, dit document...
, 4.3.18.10 Voorbeeld ................................................................................................................... 85
4.3.19 Bivariate Kernel Density Plot ............................................................................................ 85
4.3.19.2 R Module ...................................................................................................................... 85
4.3.19.5 Voorbeeld ..................................................................................................................... 86
4.3.20 Bootstrap Plot (voor Central Tendency) ........................................................................... 87
4.3.20.2 R Module ...................................................................................................................... 87
4.3.20.5 Voorbeeld ..................................................................................................................... 91
4.3.21.5 Voorbeeld ..................................................................................................................... 91
4.3.22 Cronbach Alpha ............................................................................................................... 92
4.3.22.2 R Module ...................................................................................................................... 93
4.3.22.5 Voorbeeld ..................................................................................................................... 93
4.4 Kwantitatieve data met tijdsdimensie (tijdreeksen) ................................................................ 94
4.4.1 Equi-distante tijdreeksen .................................................................................................... 94
4.4.2 Tijdreeks Plot ..................................................................................................................... 94
4.4.2.2 R Module ........................................................................................................................ 95
4.4.3. Mean Plot ......................................................................................................................... 95
4.4.3.2. R Module ....................................................................................................................... 96
4.4.4 Blocked Bootstrap Plot (Central Tendency)........................................................................ 99
4.4.4.2 R Module ........................................................................................................................ 99
4.4.4.5 Voorbeeld ....................................................................................................................... 99
4.4.5 Standard Deviation-Mean Plot ........................................................................................... 99
4.4.5.5 Voorbeeld ..................................................................................................................... 100
4.4.6 Variantie reductie matrix .................................................................................................. 101
4.4.6.5 Voorbeeld ..................................................................................................................... 101
4.4.7 Partiële autocorrelatie functie ........................................................................................... 103
4.4.7.5 Voorbeeld ..................................................................................................................... 103
4.4.8 Periodogram .................................................................................................................... 106
4.4.8.5 Voorbeeld ..................................................................................................................... 107
HOOFDSTUK 5: HYPOTHESIS TESTING .................................................................................. 109
5.1.2.1 Grafiek van de normaalverdeling .................................................................................. 109
5.1.2.2 Interpretatie van standaarddeviatie ............................................................................... 109
5.2 Populatie............................................................................................................................. 110
5.9 Statistische test voor een populatiegemiddelde met een gekende variantie ........................ 110
,R Module .................................................................................................................................. 118
5.17 Toetsen van Hypothese voor onderzoek ........................................................................... 120
5.17.1 One Sample t-Test ......................................................................................................... 120
5.17.1.2 Analyse gebaseerd op kritieke waarden ...................................................................... 120
5.17.1.3 Analyse gebaseerd op p-waarden ............................................................................... 123
5.17.1.5 Alternatieven ............................................................................................................... 124
5.17.2 Skewness & Kurtosis tests ............................................................................................. 125
5.17.2.1.1 D’Agostino skewness test ........................................................................................ 125
5.17.5.1.2 Kurtosis test ............................................................................................................. 125
5.17.2.4 Alternatieven ............................................................................................................... 127
5.17.3 Gepaarde Two Sample t-Test ........................................................................................ 127
5.17.5 Unpaired Two Sample t-Test.......................................................................................... 129
5.17.5.1 Hypotheses - examples............................................................................................... 129
5.17.5.2 Analyse gebaseerd op p-waarden ............................................................................... 130
5.17.5.3 Assumpties ................................................................................................................. 132
5.17.5.4 Alternatieven ............................................................................................................... 132
15.7.6 Unpaired Two Sample Welch Test ................................................................................. 133
15.7.6.2 Analyse op basis van p-waarden ................................................................................ 133
5.17.7 Mann-Whitney U test ..................................................................................................... 133
5.17.7.1 Classical model ........................................................................................................... 134
5.17.7.1.2 Randomization model .............................................................................................. 134
5.17.7.2 Analyse op basis van p-waarden ................................................................................ 134
5.17.8 Bayesian Two Sample Test ........................................................................................... 135
5.17.9 Mediaan Test op basis van Notched Boxplots ................................................................ 135
5.17.10 Chi-kwadraat test for Count Data ................................................................................. 135
5.17.10.1 Pearson Chi-Kwadraat Test ...................................................................................... 135
5.17.10.1.4 Analyse gebaseerd op p-waarden – Output ........................................................... 136
5.17.10.1.5 Assumptie .............................................................................................................. 137
5.17.10.2 Exacte Pearson Chi-kwadraat Test met simulatie. .................................................... 137
5.17.11 One way analysis of Variance (1-way ANOVA) ............................................................ 138
5.17.11.2 Analyse gebaseerd op p-waarden ............................................................................. 138
5.17.12 Two Way Analysis of Variance (2-way ANOVA) ........................................................... 142
5.17.12.1 Analyse gebaseerd op p-waarden ............................................................................. 142
, 5.17.13 Testing Correlations ..................................................................................................... 147
5.17.14 Nota bij causaliteit ........................................................................................................ 147
HOOFDSTUK 6: Regressie modellen .......................................................................................... 149
6.1 Enkelvoudige lineair regressie model (Simple Lineair Regression Model: SLRM) ............... 149
6.1.2 Kleinste kwadratencriterium (Least Squares Criterion) ..................................................... 149
6.1.3 Ordinary Least Squares for Simple Linear Regression ..................................................... 150
6.1.4 Assumpties om regressiemodel op te stellen ................................................................... 151
6.1.5 Statistische eigenschappen van 𝛼 en 𝛽 ........................................................................... 151
6.1.5.2 Betrouwbaarheidsintervallen van eenvoudige lineaire regressieparameters ................. 153
6.2 Meervoudig lineair regressiemodel (Multiple Linear Regression Model: MLRM) ................. 154
6.2.1.3 Unbiasedness of b ........................................................................................................ 157
6.2.1.4 Minimum variantie (Gauss-Markov Theorema) ............................................................. 157
6.2.1.7 Determinatie coëfficiënt R² ............................................................................................ 158
6.2.1.8 Relatie tussen het SLRM en het MLRM ........................................................................ 158
6.2.2 Maximum Likelihood Estimation for Multiple Linear Regression ....................................... 159
Zelf regressiemodel maken met behulp van Excel en RFC ....................................................... 169
RFC: Multiple Regression (volledig uitgelegd) .......................................................................... 175
HOOFDSTUK 7: Introductie tot tijdreeksanalyse .......................................................................... 193
7.2 Case: the Market of Health and Personal Care Products .................................................... 193
7.3. Decompositie van tijdsreeksen .......................................................................................... 193
7.3.1. Klassieke decompositie van tijdsreeksen met “moving averages” ................................... 193
7.3.2 Seizoenale decompositie volgens Loess.......................................................................... 196
7.3.3. Decompositie volgens structurele tijdreeksmodellen. ...................................................... 197
7.4 Ad hoc forecasting van tijdreeksen ..................................................................................... 199
7.4.1 Regressieanalyse van tijdreeksen.................................................................................... 199
7.4.2 Smoothing Models ........................................................................................................... 203
7.4.2.4 Single Exponential Smoothing ...................................................................................... 203
7.4.2.5 Double Exponential Smoothing ..................................................................................... 204
7.4.2.6 Triple Exponential Smoothing (Holt-Winters model) ...................................................... 205
HOOFDSTUK 8: Univariate Box-Jenkins analyse ........................................................................ 211
8.2 Data .................................................................................................................................... 211
8.3 Theoretical Concepts .......................................................................................................... 212
8.3.0.1 Stationair Processes ..................................................................................................... 212
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller nickdd. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.81. You're not tied to anything after your purchase.